>Sergey,
>
>Thanks for confirming {A cursor cannot change to read only by itself. Maybe it's recreated somewhere?} so I will have to hunt for the guy who recreated my(poor)Cursor. Shall have to make an extensive look with aid of the debugger.
>
>Thanks.
>
>Regards,
>
>Koen
>
>P.S.
>Yes I was aware of the unness. of the combination "readwrite" plus "nofilter". I just added these two for ruling out everything since some function changed the behavior of myCursor. And although it is unness. I dont believe it harms, does it?

try this:

SELECT ..... READWRITE
ASSERT .f. && You need SET ASSERTS ON somewhere before that command

Then open BreackPoint dialog and add:
Type: Break when expression is changed.
Expression: ISREADONLY([YourCursor])

Run :-)