Lately, I've been getting issues where a .vb file that isn't even open, loses chunks of itself.

 

For instance, just now, the bottom 5 lines of code were replaced with square boxes, the kind you would see in place of line feeds when you open a text document in the wrong viewer.

 

Sometimes it's more than 5 lines... I've had the whole half of a form get wiped out. Thankfully, I use Source Safe and it didn't have any changes lost, but I'd hate to lose something I was working on.