Nothing strange here (though the script had no movement so I rotated around after pressing '0' / default.c movement). Do you only have it at pan 0 or also at other angles?

Anyway, perhaps a driver problem (like a newest beta driver or such) or maybe some background program that messes things up on your machine. Also on a desktop I once had many strange problems with games after the harddisk was getting broken / old.

-edit, could also maybe be a difference between published and tested in sed.

And happy new year Acknex veterans!