Rei: Its entirely possible that a further update may be needed that has not yet been provided for windows 7. AFAIK there aren`t any TGC products that specifically support windows 7 - some don`t even support vista - but I could be wrong. The only things I can suggest you try; ensure you have latest directx9; make sure you have installed the dbp runtime(can`t remember if this affects DBP itself or DS but can`t hurt to make sure its installed); make sure administrator priveledges are active for DS. If this has already been done then you may wish to consider emailing TGC support.
Quote: "Do the DBPro updates even affect DarkShader?"
Highly unlikely since U7.4/5(I think) the dark shader commands only are included(ie not DS itself) - as a dll, which is not part of the DS installation and iirc it replaces any old DS dll that might be installed.
Quote: "I'm totally clueless as to why it suddenly started doing this. It worked fine up until a week or two ago."
Yeah that seems odd. Perhaps you have made significant change to system like a new gfx card and driver or installed a driver for your current card(ie your drivers are proving to be incompatable with DS), or maybe you turned UAC on so DS may now need administrator rights.
GG: Its the least anyone here could do for the guy that has given so much to the users here.