If you’ve been using VS 2010 for anything more than a few minutes you have probably had the clipboard issue – ie, copy and paste randomly breaks.  This is documented on MS connect here and probably elsewhere. 

The current recommendation is to install VS 2010 SP1 beta which I did this morning.

Unfortunately this doesn't work for me.  I still get random errors, albeit slightly different.  Now when I paste, the cursor moves back to what I had selected and nothing is pasted.

Happy days !