>The timer isn't in order to get the grid refreshed per se. The timer is checking for data coming in from an outside source, handling that data, and then calling the code to refresh all open forms with the new data.
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>Based on our response and Naomi's, I need to clarify that the problem occurs when the user clicks on the grid. I'll double-check, but I'm pretty sure that as long as that doesn't happen, all the refreshes work just fine.

Just a hunch (or else I'd have fewer problems with my own now-I'm-empty-now-I'm-not grids) - what would happen if you'd make sure that the focus is not on the grid? VFE style if need be, immediately after locking the screen, add a new textbox to the parent, move it to -2000, -2000, set focus to it, do your grid thing, remove the textbox, set focus to the grid (with maybe a GO to appropriate record - same one as before, if possible), then unlock screen and... did it work?

I've had a problem with similar symptoms (not saying the same problem - just looking the same) on and off many times, but still too few and far between to catch any regularity in them. Hence, a hunch.