I'm having a similar problem.
In the instruction:
"To temporarily fix it, go to the WA_AB_checkMultiInsertLoopedFieldsExist and change the instances of WA_AB_checkLoopedFieldsExist to WA_AB_checkMultiInsertLoopedFieldsExist and it will work correctly."
Do you mean change ALL instances, or only in a specific area? (I've tried both and get the same result - the form submits and goes to the destination page, but nothing is added to the database.
Help MUCH appreciated!
BTW - given that this was first reported so long ago, it's disappointing to see that it hasn't yet been fixed in a dot release!