I have searched for the patch that fixes this problem in the current development code and built a fixed library. You have to install the file manually though. The fix is for CrossOver 6.2.
1) Go to dl.codeweavers.com, use the access key hl2fix
2) Download the user32.dll.so file for your platform(Mac or Linux)
3) Copy the file into the crossover installation directory.
On mac, right click on the Crossover program icon, and select "Show Package Content". Go to Contents->SharedSupport->Crossover->lib->wine, and place the file there.
On Linux, Crossover is most likely located in /opt/cxoffice or ~/cxoffice/. Put the file into lib/wine
Please do not file support tickets with the modified Crossover. If you have a problem for which you want to file a ticket, please restore a clean CrossOver installation.