Justin-

>Once the event has been kicked off a second time, I SOMETIMES get this error message:
>'Table has one or more non-structural indexes open. Please close them and retry the Begin Transaction.'


If you search on "non-structural" or "1548" which is the error code you'll see a couple of recent threads on the subject.

Do you anywhere create an indices on the fly? Sometimes the DE will create one for you if you create a relationship in the DE that requires a different index.