I was able to reproduce these odd behaviors with Xubuntu 12.04 x64. Therefor it is probably not something Gnome specific as it happens with Xcfe as well.
I have not installed Virtual Box on this system yet. So that rules out all VM involvement.
I did a bit of research. These rss-glx screen savers seem to come from Terence Welsh / Really Slick. I have contacted him directly, referencing this support thread.
I was able to reproduce these odd behaviors with Xubuntu 12.04 x64. Therefor it is probably not something Gnome specific as it happens with Xcfe as well.
I have not installed Virtual Box on this system yet. So that rules out all VM involvement.
I did a bit of research. These rss-glx screen savers seem to come from Terence Welsh / Really Slick. I have contacted him directly, referencing this support thread.