1. Pressing Backspace doesn't update "last key" status. --- > Type ক, then press Backspace to delete ক.

If you type "Reph" then, although you have deleted ক, Avro Keyborad will produce র্ক.

2.
Layout Viewer may not be shown:
Layout Viewer may not be shown anymore for this bug. It opens, but remains minimized.

Reason of this problem : This problem can occur only when the user closes the "Layout Viewer" when it is minimized. For convenience of users, the window of "Layout Viewer" always saves its last position when closing, and next time it shows itself on that position. As it was minimized at the last time, it cannot restore itself because the registry settings are incorrect.

The solution : I have removed the bug for the next version. But for now, you have to do it manually. Just try to follow these instructions -
1) Close Avro Keyboard
2) Click on the Start Button, then click on Run
3) Type regedit. An Windows Explorer like interface will open
4) Through the left panel, go to My Computer\HKEY_CURRENT_USER\Software\OmicronLab\Avro Keyboard
5) DELETE LayoutViewerPosX and LayoutViewerPosY on the right panel. Leave other settings intact.

WARNING : Always be careful when working with Registry. Your system may crash permanently for a wrong change.

The problem is now solved! And for the next time, please be careful not to close the Layout Viewer when it is minimized.

Bug detector : Mr. Nilotpal Bhattacharyya