Thanks SET and Ed, that's good to know... Not understandable indeed, why "Open" is there, if it's not supposed to be used / doesn't work properly...

Since I don't have a certain way to reproduce the error, I wouldn't be able to check, if using "First" instead of "Open" worked, so to be sure I've replaced all the IB_Cursor with IBOQueries now. Shouldn't matter in this case, because only one row / field is beind returned by those statements.

However, we have many more places where IB_Cursor are being used. Will have to watch them closely, I guess...

Thanks for your replies.