Mouse freezing problem under Debian Testing

Hi, trying to track down a really odd behavior with WM 0.91.0 and 
applications under Debian Testing, running XFree 4.3.0.dfsg.1-14

When using Ctrl-Click to higlight multiple items in a list (such as my 
Inbox in Thunderbird, or news articles in Pan, or multiple files in k3b) 
the mouse freezes. If I use Ctrl-Alt-F2 (or one of the other virtual 
terminals) to leave the X session, then Ctrl-Alt-F7 back to Windowmaker, 
things go back to normal.

Has anyone seen anything like this? I can't pinpoint when it actually 
started happening, but it has only been over the past few months, 
possibly with an upgrade.

Logs don't show any problems. I've checked Debian's bug lists for any 
clue, but wasn't able to find anything. And the Windowmaker bug list is 
currently offline. I'm still poking around Google and Debian's site, but 
thought it might be worth asking here as well.

Thanks in advance!

jef
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