I've tried everything I know, which isn't a great deal really!
Stellarium just will not show the mouse pointer under Windows 7 64bit.
When I left click the mouse, the round object locator displays on the screen, but the pointer is nowhere to be seen. The only way I have of closing Stellarium down is Alt+Tab etc. I can't access any configuration or location options etc. so it's effectively useless.
It seems that I shall have to use it under VMWare with the Windows XP virtual machine, which means it will rarely get used!
So, back to good old reliable Carte Du Ciel, not such a pretty display, but there are never any display or mouse problems with CDC !
Chris