>>>I don't understand why this isn't working. I've done this lots of times and never had a problem. And why does browsing the table make it start working?
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>>I meant to ask, also, do you have a relation set on the table?
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>No, I just reset the filter/key when the parent changes.

Is there an index set on the table? That could cause trouble, too...I did find a bug doc about filtered tables and grids, couldn't tell if it was relevant or not...it suggested using macros in the SET FILTER command.