My report in reply #14 was not meant to indicate that using Xorg would resolve the issue. It is possible that using Xorg might produce similar, but different symptoms arising from an as yet unidentified cause.
Full Xorg is not specified as a requirement by Minitube. This is usually an indication that Xvesa is OK. Supplying feedback on Xvesa was an attempt to provide controlled, repeatable conditions to assist with finding a fix. It might be possible to do something similar with Xorg.