Do not work Ctrl+c/Ctrl+v

That was possible to me about two months ago. But now I can't do any operation with copy-paste using key combinations:
- copy or paste within "text"
- copy or paste any element
- etc.

My operation system is Ubuntu 10.10 (Linux nick 2.6.35-29-generic #51-Ubuntu SMP Fri Apr 15 17:13:54 UTC 2011 i686 GNU/Linux).
Browser - any.

Situation with Ctrl+z is the same.
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