I am using the latest version of ACT 4.5.7.123 & found a particular bug when changing years. Its really hard to repro the issue so ill be as thorough as possible. The bug can be reproduced in the "Default Calendar"(first one) & the "Calendar with an associated button"(Third one) available as demo here: [ACT Samples](http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/Calendar/Calendar.aspx)
Or you can also, create a new project, add a textbox & a CalendarExtender.
```
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<ajaxToolkit:CalendarExtender ID="TextBox1_CalendarExtender" runat="server"
Enabled="True" TargetControlID="TextBox1">
</ajaxToolkit:CalendarExtender>
```
1.- Using your mouse only click on the "Month, year", to get to the month selection,
2.- Then click on the year to get to the year selection.
3.- Click on "2012", click on April, then click on day 4
the current value should be "04/04/2012"
During this whole process you should only use your mouse, do __not__ type the date.
4.- remove your focus from the calendar and then click again on the "Month, year" at the top.
5.- Click on the year, then on "2013"
__Result:__
The year selected is not "2013" it stays at "2012".
The issue seems to only happen when dealing with the current year and the previous one, changing to any other year makes the control behave normally again.
Or you can also, create a new project, add a textbox & a CalendarExtender.
```
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<ajaxToolkit:CalendarExtender ID="TextBox1_CalendarExtender" runat="server"
Enabled="True" TargetControlID="TextBox1">
</ajaxToolkit:CalendarExtender>
```
1.- Using your mouse only click on the "Month, year", to get to the month selection,
2.- Then click on the year to get to the year selection.
3.- Click on "2012", click on April, then click on day 4
the current value should be "04/04/2012"
During this whole process you should only use your mouse, do __not__ type the date.
4.- remove your focus from the calendar and then click again on the "Month, year" at the top.
5.- Click on the year, then on "2013"
__Result:__
The year selected is not "2013" it stays at "2012".
The issue seems to only happen when dealing with the current year and the previous one, changing to any other year makes the control behave normally again.