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Similar problem with several of our seats of AcadM 2011 on Windows7 OS.
When first started, everything works fine. But after awhile copy/paste stops working, as does double-click edit.
Closing and starting Acad brings it all back again, but I have to do this several times a day.
As Yul Brenner said in "The King and I", "IS A PUZZLEMENT!"
We have in our office 2 Mechanical 2009, 6 AutoCAD 2009.
The standard parts created with AMECH 09 dissapear when you open the archive in ACAD 2009. Why????