Has any solution to this been found, as I am having a similar problem? Procedure in a TEO linked to a field is not firing on a form with several other TEOs and UI elements.
Specifically, if the “End Editing” or the “Tab” option is the only item checked under the TEO’s Procedure Trigger section, then the procedure doesn’t fire. It fires when any of the other options are individually checked (although I didn’t test the Handler option).
I’d be happy to provide a copy of my database if necessary.