Hi,
I've been using VirtualBox on OSX for more than a year now, with Windows guests (XP and Windows 7), and I always had issues with OpenGL apps running on them when I enable hardware acceleration (I mean not games, not fullscreen, just normal -windowed- OpenGL apps) . Flickering, artifacts, corrupted Windows desktop are symptoms that use to appear, and this happened on every update I tried (yes, guest additions installed).
I'm asking this because I'm beginning to wonder if this is a widespread issue when using Virtualbox on Mac hosts, or if it just affects me.
If it's a known issue, please consider improving OpenGL support, as all applications I use on Virtualbox use OpenGL.
Thanks a lot for developing Virtualbox!!
asiga