Yes, logging in as admin on both OS's. I would assume some side-effect of IE9, but... I really don't want to pollute my sister-in-law's PC with another browser ( nor explain to her why/when to use each ). Her DIR-655 is behind in firmware, but trying to isolate where the issue is before doing anything rash.
EDIT: I tried compatibility mode in IE9...that seems to be the simple answer.