Most errors also get logged in /var/adm/Xorg.log (or /var/log or similar directory name). Check your log directory for X's log.
I also suggest posting on Mint's forum to see if others had similar issues with wxPython pop-ups in KDE (or, google for similar issues, it's probably something that's come up for other platforms.)
I did a quick google search myself, and came across a few things with Mint. One was related to nvidia's driver for the mouse. Their suggestion was 1) try a different mouse and/or 2) try a different nvidia driver version. Not sure this would be helpful to you.http://forum.linuxmint.com/viewtopic.ph ... d3#p693048
Another post was related to some config options for Mint and/or kde:http://forum.linuxmint.com/search.php?s ... 6b5c3c3bd3
Most linux systems are pretty similar, with small differences in how they start up, what desktop they use by default, etc. The underlying system is pretty much the same. So your real issue is KDE killing the wxPython pop-ups for some reason (maybe something like KDE stomping them because it thinks you moved the mouse or it refreshes the screen too quickly. Just a guess. KDE likes leaving my sound system in a weird state that creates a high-pitched noise through the speakers.. KDE has a lot of quirky bugs. Add to it wx's interminable bugs and it'll make you pull your hair out
We all have to climb that steep learning curve sooner or later to get Linux working right (hey at least Linux gives the option to learn and FIX these things