diff --git a/res/layout/calc_history_button.xml b/res/layout/calc_history_button.xml
index 3b70e78e..57a5de5e 100644
--- a/res/layout/calc_history_button.xml
+++ b/res/layout/calc_history_button.xml
@@ -11,7 +11,7 @@
 													   a:text="@string/c_history_button"
 													   calc:textUp="@string/c_undo"
 													   calc:textDown="@string/c_redo"
-													   calc:hTextPosition="0.33"
+													   calc:hTextPosition="0.25"
 													   style="?controlButtonStyle"
 													   a:textStyle="bold"
 													   a:onClick="historyButtonClickHandler"/>
\ No newline at end of file
diff --git a/res/values-ru/strings.xml b/res/values-ru/strings.xml
index 2a845c7f..cdb22f0e 100644
--- a/res/values-ru/strings.xml
+++ b/res/values-ru/strings.xml
@@ -27,7 +27,7 @@
 		За подробной информацией, пожалуйста,\nобращайтесь на почту\n<a href="mailto:se.solovyev@gmail.com">se.solovyev@gmail.com</a>\n
 		или посетите сайт \n<a href="http://se.solovyev.org">http://se.solovyev.org</a>\n\n
 		Если вы хотите поддержать проект материально\nвы можете сделать это через \n<a href="https://www.paypal.com/cgi-bin/webscr?cmd=_donations&amp;business=se%2esolovyev%40gmail%2ecom&amp;lc=RU&amp;item_name=Android%20Calculator&amp;currency_code=USD&amp;bn=PP%2dDonationsBF%3abtn_donateCC_LG%2egif%3aNonHosted">http://paypal.com</a>\n\n
-		Если вам понравилось приложение - поставте 5 звёздочек в <a href="https://market.android.com/details?id=org.solovyev.android.calculator">андроид.маркете</a>
+		Если вам понравилось приложение -\nпоставте 5 звёздочек в\n<a href="https://market.android.com/details?id=org.solovyev.android.calculator">андроид.маркете</a>
 	</string>
 
 	<string name="c_undo">назад</string>
@@ -78,7 +78,7 @@
 		пожертвовать денег через\n\n
 		<a href="https://www.paypal.com/cgi-bin/webscr?cmd=_donations&amp;business=se%2esolovyev%40gmail%2ecom&amp;lc=RU&amp;item_name=Android%20Calculator&amp;currency_code=USD&amp;bn=PP%2dDonationsBF%3abtn_donateCC_LG%2egif%3aNonHosted">
 			http://paypal.com</a>\n\n
-		или поставить 5 звёздочек в <a href="https://market.android.com/details?id=org.solovyev.android.calculator">андроид.маркете</a>
+		или поставить 5 звёздочек в\n\n<a href="https://market.android.com/details?id=org.solovyev.android.calculator">андроид.маркете</a>
 	</string>
 
 	<string name="c_history">История</string>
diff --git a/res/values/strings.xml b/res/values/strings.xml
index cd7480c6..d7fcd38c 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -28,7 +28,7 @@
 		For more information please\ncontact the author by email\n<a href="mailto:se.solovyev@gmail.com">se.solovyev@gmail.com</a>
 		\nor visit\n<a href="http://se.solovyev.org">http://se.solovyev.org</a>\n\n
 		If you want to support the project\nyou can donate money via\n<a href="https://www.paypal.com/cgi-bin/webscr?cmd=_donations&amp;business=se%2esolovyev%40gmail%2ecom&amp;lc=RU&amp;item_name=Android%20Calculator&amp;currency_code=USD&amp;bn=PP%2dDonationsBF%3abtn_donateCC_LG%2egif%3aNonHosted">http://paypal.com</a>\n\n
-		If you like the application rank it with 5 stars in <a href="https://market.android.com/details?id=org.solovyev.android.calculator">android.market</a>
+		If you like the application\nrank it with 5 stars in\n<a href="https://market.android.com/details?id=org.solovyev.android.calculator">android.market</a>
 	</string>
 
 	<string name="c_undo">undo</string>
@@ -79,8 +79,8 @@
 	<string name="c_donate">Donate</string>
 	<string name="c_donate_text">You can thank the author of this program by email\n\n
 		<a href="mailto:se.solovyev@gmail.com">se.solovyev@gmail.com</a>\n\n
-		donating money via\n\n<a href="https://www.paypal.com/cgi-bin/webscr?cmd=_donations&amp;business=se%2esolovyev%40gmail%2ecom&amp;lc=RU&amp;item_name=Android%20Calculator&amp;currency_code=USD&amp;bn=PP%2dDonationsBF%3abtn_donateCC_LG%2egif%3aNonHosted">http://paypal.com</a>\n
-		or setting 5 stars in <a href="https://market.android.com/details?id=org.solovyev.android.calculator">android.market</a>
+		donating money via\n\n<a href="https://www.paypal.com/cgi-bin/webscr?cmd=_donations&amp;business=se%2esolovyev%40gmail%2ecom&amp;lc=RU&amp;item_name=Android%20Calculator&amp;currency_code=USD&amp;bn=PP%2dDonationsBF%3abtn_donateCC_LG%2egif%3aNonHosted">http://paypal.com</a>\n\n
+		or setting 5 stars in\n\n<a href="https://market.android.com/details?id=org.solovyev.android.calculator">android.market</a>
 	</string>
 	<string name="c_history">History</string>
 	<string name="c_history_button">M</string>
diff --git a/src/main/java/org/solovyev/android/calculator/CalculatorModel.java b/src/main/java/org/solovyev/android/calculator/CalculatorModel.java
index d9f9b5a6..e7a22584 100644
--- a/src/main/java/org/solovyev/android/calculator/CalculatorModel.java
+++ b/src/main/java/org/solovyev/android/calculator/CalculatorModel.java
@@ -135,15 +135,20 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 
 			editor.redraw();
 
-			evaluate(delayEvaluate, editorStateAfter, jsclOperation);
+			evaluate(delayEvaluate, editorStateAfter, jsclOperation, null);
 		}
 	}
 
 	@NotNull
 	private final static MutableObject<Runnable> pendingOperation = new MutableObject<Runnable>();
 
-	private void evaluate(boolean delayEvaluate, @NotNull final String expression, @NotNull final JsclOperation operation) {
-		final CalculatorHistoryState historyState = getCurrentHistoryState();
+	private void evaluate(boolean delayEvaluate, @NotNull final String expression, @NotNull final JsclOperation operation, @Nullable CalculatorHistoryState historyState) {
+		final CalculatorHistoryState localHistoryState;
+		if (historyState == null) {
+			localHistoryState = getCurrentHistoryState();
+		} else {
+			localHistoryState = historyState;
+		}
 
 		pendingOperation.setObject(new Runnable() {
 			@Override
@@ -155,7 +160,7 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 						// actually nothing shall be logged while text operations are done
 						evaluate(expression, operation, this);
 
-						historyState.setDisplayState(getCurrentHistoryState().getDisplayState());
+						localHistoryState.setDisplayState(getCurrentHistoryState().getDisplayState());
 
 						if (pendingOperation.getObject() == this) {
 							// todo serso: of course there is small probability that someone will set pendingOperation after if statement but before .setObject(null)
@@ -167,22 +172,26 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 		});
 
 		if (delayEvaluate) {
-			CalculatorHistory.instance.addState(historyState);
+			if (historyState == null) {
+				CalculatorHistory.instance.addState(localHistoryState);
+			}
 			new Handler().postDelayed(pendingOperation.getObject(), EVAL_DELAY_MILLIS);
 		} else {
 			pendingOperation.getObject().run();
-			CalculatorHistory.instance.addState(historyState);
+			if (historyState == null) {
+				CalculatorHistory.instance.addState(localHistoryState);
+			}
 		}
 	}
 
 	@Override
 	public void evaluate() {
-   		evaluate(false, this.editor.getText().toString(), JsclOperation.numeric);
+   		evaluate(false, this.editor.getText().toString(), JsclOperation.numeric, null);
 	}
 
 	@Override
 	public void simplify() {
-   		evaluate(false, this.editor.getText().toString(), JsclOperation.simplify);
+   		evaluate(false, this.editor.getText().toString(), JsclOperation.simplify, null);
 	}
 
 	private void evaluate(@Nullable final String expression,
@@ -193,8 +202,7 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 			try {
 				Log.d(CalculatorModel.class.getName(), "Trying to evaluate '" + operation + "': " + expression /*+ StringUtils.fromStackTrace(Thread.currentThread().getStackTrace())*/);
 				final CalculatorEngine.Result result = calculatorEngine.evaluate(operation, expression);
-				if (currentRunner == pendingOperation.getObject()
-						&& expression.equals(this.editor.getText().toString())) {
+				if (currentRunner == pendingOperation.getObject()) {
 					display.setText(result.getResult());
 					display.setJsclOperation(result.getUserOperation());
 				} else {
@@ -289,6 +297,13 @@ public enum CalculatorModel implements CursorControl, HistoryControl<CalculatorH
 			setValuesFromHistory(this.editor, editorHistoryState.getEditorState());
 			setValuesFromHistory(this.display, editorHistoryState.getDisplayState());
 
+			final String expression = this.editor.getText().toString();
+			if ( !StringUtils.isEmpty(expression) ) {
+				if ( StringUtils.isEmpty(this.display.getText().toString()) ) {
+					evaluate(false, expression, JsclOperation.numeric, editorHistoryState);
+				}
+			}
+
 			editor.redraw();
 			display.redraw();
 		}
diff --git a/src/main/java/org/solovyev/android/view/widgets/ColorButton.java b/src/main/java/org/solovyev/android/view/widgets/ColorButton.java
index b917bb67..07902a1d 100644
--- a/src/main/java/org/solovyev/android/view/widgets/ColorButton.java
+++ b/src/main/java/org/solovyev/android/view/widgets/ColorButton.java
@@ -60,6 +60,8 @@ public class ColorButton extends Button {
 	private final OnClickListenerVibrator onClickListener;
 
 	private static final float H_TEXT_POSITION_DEFAULT_VALUE = 0.5f;
+
+	// todo serso: check - currently not worked
 	private float hTextPosition = H_TEXT_POSITION_DEFAULT_VALUE;
 
 	public ColorButton(Context context, AttributeSet attrs) {
@@ -206,6 +208,14 @@ public class ColorButton extends Button {
 	 	this.onClickListener.onClick(this);
 	}
 
+	public float getHTextPosition() {
+		return hTextPosition;
+	}
+
+	public void setHTextPosition(float hTextPosition) {
+		this.hTextPosition = hTextPosition;
+	}
+
 	@Override
 	public boolean onTouchEvent(MotionEvent event) {
 		boolean result = super.onTouchEvent(event);