>I spoke to a colleague who is somewhat FoxPro knowledgeable, and he seems to think it is 8.0 internal bug with Datagrid, and he recommended I remove LinkMaster property setting for child grid, and first set link from Parent field to Child field programmatically at Form load, and re-set it when I click a different row in parent grid. Do you concur with these thoughts?
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>dbk

Not sure - haven't heard of that one - but an easier test would be to recompile it under 7.0 or 6.0 and see if it makes a difference. Then I would do all the other stuff if needed.