I'm running the Windowblinds 4.3 demo (I'm hoping to buy a full copy soon, the rest of OD doesn't appeal to me but WB does,) and I've noticed a strange bug.
I recently installed a new motherboard on his computer, and I had to reinstall XP. I went up to SP2 RC2 (I had been using RC1 before the new mobo with no problems,) and then started installing everything I used to have. The first thing I reinstalled was my WB 4.3 demo. Everything seemed to work fine until I loaded the control panel. When I loaded it, the taskbar went blackit looked like the skin was corrupted. Changing skins seemed to fix it somewhat, except now the taskbar isn't skinned. The only way to get the taskbar skinned again was to reload WB. I'm not sure if this is present in the full version (although I don't see why it wouldn't be.) I'm 99% sure this is a WB bug, mainly because this is a fresh install of XP and the taskbar doesn't disappear with the default skin.
If you need a screenshot, I can provide one.