>>The problem is that the error is always in different places.
>
>I've re-read the whole thread, and at least four people said you should rebuild your indexes (not just reindex). I haven't found anywhere that you said you did, just that you believe SDT should be doing that.
>
>Well, are you postive that you're doing this with new set of indexes? Maybe you should make sure that SDT has gone through the recreation of indexes first, before trying anything else.

I used our utility to Reindex few times. I also tried Repair option. In addition I tried to pack few tables (we have ~200 tables in a database). So far nothing worked. I'm thinking it may be relevant to the code itself and I would be happy to send two programs to anyone just to take a look and see, if there is an obvious hole. For instance, I'm thinking havy mix of dbase code with SQL-select code may contribute to the problem...