I've just recently attempted to open a dockzip on Vista x64 and noticed that the window doesn't show correctly. The screen shot shows how the two buttons are cut off.
Note: This only happens when a WindowBlinds skin is applied. I've tested three skins; Diamond, Adamant, Adrenaline and reproduced it with all three. Unloaded WindowBlinds and tried it with just Aero running and it showed fine.
Specs:
Vista Ultimate x64
Object Dock Plus version 1.90i[b].020
Windowblinds 6 version 6.00[b].099