At some point shortly after upgrading Vista Business 64-bit to Windows 7 Pro 64-bit top level menus from all programs started displaying by expanding to the left. For example, in a program with a "File" item on its main window bar, when I click on it,
the "File" menu expands to the left so that the menu's display pane appears with the extreme right edge under the mouse pointer over the "File" entry on the main menu bar.
If the menu has a sub-menu expansion indicated by a right-facing arrow, when I click such an item, it expands to the left of the parent menu box.
Similarly right-click context menus (e.g. Desktop display properties menu) also expand leftward leaving the mouse pointer at the extreme right edge of the menu display pane.
Note that "custom" menus generated by program specific buttons implemented in a window within the main program window (usually appearing below the main menu bar) do not suffer from this problem.
It seems to me that there must be some obscure registry setting that was 'clobbered' by some installation (Office 2010 beta?, vcredist? ...?) that I have been unable to locate and fix. Anyone know how to fix this problem?
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How to back up and restore the registry in Windows