Pretty much everything.
What does not
Minimizing a TreePad window, or trying to switch it between workspaces, can make it disappear. The instance is still running - just not visible. When that happens, I just kill the process. This has only been a nuisance level problem, at worst. I've not lost any data as a result, possibly due to autosave. It is also infrequent - or perhaps I just don't push it in that direction any more!
What was not tested
|Operating system||Test date||Wine version||Installs?||Runs?||Used|
|Current||Ubuntu 11.04 "Natty" i386 (+ variants like Kubuntu)||Jul 25 2013||1.2.2||Yes||Yes||Bronze||an anonymous user|