I loaded OpenSuSE 11.2 and got the same error message as the other poster. I tried to install the guest additions, but I'm not sure I did it correctly. I clicked the line in the devices tab, but nothing seemed to happen. As root, I opened the guest additions iso, and ran the "vbox linux additions" and said "yes" when it asked me. I'm not sure if I should have, and I'm not sure what, if anything, it loaded. When I run sax2, it shows only a 24bit mode available. When I set that, the error message still says 16bit, even though sax2 says I'm running in 24bit mode. Do I just ignore the error message, or have I got something set up wrong?
Is there a way to tell what guest additions are loaded?