Hi Chris,
You might want to hunt about, and try to determine if the issue is
yet another example of winebug #6971 ...see ;
http://bugs.winehq.org/show_bug.cgi?id=6971
That bug has been high on the hit list, and now that it's marked fixed,
that code apparently now present in wine-1.3.20 (and xorg-server 1.7.7 or
better) that corrects this, will have to merge into some next CXG release.
I suppose the easiest way to sus it out, would be to install the wine-1.3.20
release, make sure your xorg-server is of the required version (perhaps that
applies to the xorg-input package as well), and install XIII into that wine
environment and see if it works....or not, as the case may be {shrug}...
...if it does fix things, then it'd be good to know...come to think of it,
I've got a number of apps borked by #6971 which I should check myself ; I'll
have to see where the deb6 is xorg wise....
Cheers!