Could you start playonlinux from a terminal and tell us what's displayed while it initializes?
(For background info:
PlayOnLinux comes with a small C program that tries to create a GLX context and report back:
This program is precompiled for i386 and amd64, and compressed with bzip2:
Those should be present in your PlayOnLinux installation
I rebooted and this went a away. I had a new kernel installed that I had not yet booted into, so I wonder if this was the cause of the issue. If I see it reoccur I will try to post more details.
From my point of view that means that the detection worked, and that you couldn't run 3D accelerated apps at that time (Note to myself: next time suggest to try to run a 3D native app, glxgears or whatever).
But that is not true. I was able to run games fine. I even fired up games to test after getting the error to ensure something hadn't broken. The detection seems to be broken in certain circumstances. Regardless you can leave this marked 'fixed' I guess and if I see it again I'll try to provide more detail to narrow down the situation.