Ok, what happens if just before your refresh of the grid you put:

lnrecno = RECNO('main')              && or whatever the grid's recordsource is
thisform.pgframe.pg3.grid1.refresh() && or whatever and where-ever it is
IF recno('main')<>lnrecno
    GOTO lnrecno IN MAIN
ENDIF

>The List tab (fourth and lat tab on this pageframe) is where record navigation occurs. The first tab is where data entry/editing occurs. So, yes, changes and adds do occur when the grid on the List tab does not have focus. When the user clicks back on the List tab, one of the things I do is refresh the grid on that tab. The record pointer is ok, but as soon as the grid is refreshed, it moves. That never happened under VFP 7 or prior.
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>>Why are you refreshing the grid there? Are you adding, modifying, or deleting records to the table in the grid when focus is off the grid?