I have Windows 7 64-bit.
When I copy something using Ctrl+C, Right-Click Copy, Snipping Tool, or any other 3rd Party Screen Copy Software, I can not paste my selection unless it is the very next step I do.
Example: I can't copy something from a word document, open up my web email, compose a new message, and then paste into them email. I have to open up the web email, compose the message first, then copy from a word document and immediately paste it into the web email.
If I don't paste immediately after I copy, it's like I never did the initial copy in the first place.