You guys aren't being ignored - we've just been too busy (work, school, real life in general) to research the answers that we don't know. Apologies for the wait, and thank you for your patience. <3
Sunfang, sorry, but I haven't run into a way to correct the mistake, as there's no layer rotation option - just the canvas. xc
Crystal, all I can think of off of the top of my head are tablet drivers. Try uninstalling and redownloading/reinstalling them, they may have fallen out of date or gotten a little corrupted.
Diversity, I've two ideas, but I'm not sure if they'll work. You can try clearing your cache, or... very rarely, switching to Opera may help. It works for me, but almost every time I suggest it, it doesn't play nice. ^^;
..(X).. - No, sorry. We do have the Art Galleries board, though, if you can get an art program to work, or you can upload photos of traditional art.