Hello Firestrider,
I get this PDF issue sometimes as well. I find that refreshing the opened tab helps it display properly afterwards usually.
Favorites are stored at the same
C:\Users\(user name)\Favorites location as in Vista. It's just not in the Start menu user (personal) folder by default as in Vista though. You can
customize the Start menu to have the Favorites button by checking
the Favorites menu box option to make accessing this easier for you.
Hope this helps,
Shawn