>BTW, probably I'm being lucky, but after some recent changes in the program I don't get this error anymore. Unfortunately, I'm not sure what did help me to get rid of them and if indeed my errors are gone. Perhaps, they surrender knowing Aleksey was going to look at them <g>

Don't we all love Heisenbugs the best? When you don't know what caused it, and know even less what fixed it :).