Do you have ia32-libs installed? If so, try temporarily uninstalling it and see if the issue can still be reproduced. If not, I might suspect a conflict between nvidia's glx and the mesa snapshot glx within ia32-libs.
Do you have ia32-libs installed? If so, try temporarily uninstalling it and see if the issue can still be reproduced. If not, I might suspect a conflict between nvidia's glx and the mesa snapshot glx within ia32-libs.