Here's my issue with 0.9.4 on XP and wireless mouse.
The volume changes randomly -- usually up or down by about 10% on watching any video file. It usually happens once in every 15 mins or so.
I've never had this problem with any previous version of VLC with the exact same setup.
I've got to the point now where I'm most probably going back to an 0.8 version. In addition to this problem, the mouse wheel changing volume is not something I ever want, and I find the GUI wastes space (the button bar at the bottom is far, far too large). I'm also seeing interlacing artifacts with DVDs that I'm fairly sure I've not seen before on previous versions.