katoda_ltd,
hmm... no, I can't reproduce this problem on the same OS/Miranda version.
I would suggest you to make a copy of your profile, load it into Miranda, remove all accounts from it (it will remove all passwords, histories & contacts), compact the database (Main menu - Database - Compact) and try to reproduce the problem with this copy. If the problem persists, pack everything together with dlls, dat etc and send the link to this archive to me via email (ghazan at miranda point im)
thanks for your efforts