Hi Shawn,
This is not a known issue - I just tried working with the mouse in aspx, js, and cs files on my Beta2 install and it worked for all three file types. Could you
file a bug with as much detail as possible in the steps to reproduce? Each issue is looked at individually and routed to the right team within Visual Studio, so reporting a bug through Microsoft Connect is the fastest way to get it to the right people for investigation.
Thanks for trying VS 2010 Beta2 and posting your feedback!
Brittany Behrens
Program Manager, VS Platform
http://blogs.msdn.com/visualstudio