I've had this problem in the past three versions of ACT and it's very annoying. Currently running 2011.
It seems the "Ctrl-V" pasting function only works sometimes in ACT. When it stops working (often) I either have to right-click and select "paste", or restart ACT to regain the "ctrl-v" function. Just one of the many little but OBVIOUS things I wish ACT would have the insight to fix after 3 revisions of their software. Grrrrrrr.
