http://bugs.winehq.org/show_bug.cgi?id=31298
Gianpaolo gianpaoloc@gmail.com changed:
What |Removed |Added ---------------------------------------------------------------------------- CC| |gianpaoloc@gmail.com
--- Comment #1 from Gianpaolo gianpaoloc@gmail.com 2013-02-28 14:48:45 CST --- I can confirm the bug. It happens to me on three different notebooks. One runs debian sid x86_64, wine 1.4.1 (debian package) and has office 2007 installed in a clear wineprefix. The second one has debian sid i386, wine 1.4.1 (debian package) and office 2007. The third one runs linux mint 13 x86_64 with wine 1.5.24 (wine packages for ubuntu) and has office 2010 installed.
Notice that the three machines also have different window managers (the two debian machines use xfce, the mint machine has cinnamon) and different graphical cards (the i386 debian and the mint machine have an intel embedded card, the x86_64 debian machine has an nvidia card with the binary nvidia drivers).
The problem is very easy to replicate (and it has been perfectly described). Just open two excel files and try to switch from one to the other using your window manager (e.g., through alt-tab). The "tiny little window with nothing on it" will appear in the top left corner of the screen and stay there until you close excel.
Please, let me know if I can help by providing additional information.