Just noticed it is doing this very same thing in Windows XP 32-bit, SP3, all updates current. Menus moving left and right off of main right click menu is extremely erratic. Sometimes it works correctly, but most times not.
WindowBlinds version : WindowBlinds 7.3 (build 97 x86)
WindowBlinds is installed correctly on this PC
WindowBlinds appears to be activated on this PC
Your machine supports per pixel borders on WindowBlinds skins.
(Dell 2408WFP(Digital)) 1 is attached to NVIDIA GeForce GTS 250
Wblind.dll 2011/10/04 10:01:20
Wbsrv.dll 2010/02/03 16:33:56
SevenConfig.exe 2011/10/04 10:01:38
Wbload.exe 2010/10/20 16:08:35
Wbhelp.dll 2011/10/04 10:01:37
Wbui.dll 2009/06/04 16:14:05
Tray.dll 2009/10/23 20:12:19
Screen.exe 2010/06/07 15:59:43
The only time the sub-menu should be on the left is when there is not enough room for it to appear on the right, period. In WB 7.3 the only time it is appearing on the right is when there is no room on the left, like everything is reversed.