>>Other than that:
>>
>>- Is it possible the focus is on some grid element when this code runs?
>
>Yes, and amazingly, this happens on first record only. For some reason the grid doesn't like the first record being touched.
>I could put an inactive record (ie. one I can tell the user (myself) to never touch...) as the first one. Not a solution but a sign that there's a missing lid on this manh... personhole.

Added a fake record to be the first and now it's erroring out on the exact same record which is now second... more investigation due after doček.