Well I still don't beleive it but it seems it works now.
What I did:
1. I made a copy of RB folder and named it Realband_old
2. I updated Realband with an update dated January 2013 that I found on the Internet.
3. I tried and the problem was still there
4. so I deleted Realband
5. Changed again the name Realband_old ->Realband
6. I tried and the problem was still there.
7. Turned off and on the PC and it works. It seems to be solved.

Thank you anyway for trying to help.