Wanted to post an update to this item as we figured it out after a lot of trial and error. There actually were 2 issues.

1. There was some encoding or something going on in one of our windows that was causing the object not to regenerate. It was in an inline SQL statement. We re-wrote that statement from scratch and that fixed that window.

2. The other window was weirder, but it also dealt with inline SQL statements. It would not regenerate. If we checked it out, we got a message that there was a "compile/import failure in phase 3" with no other messaging. We went through and commented out all functions and events and the window regenerated. We then walked through each script and uncommented one by one until we found the offending script. Once we found that script, PB just crashed when we tried to save it. We didn't see anything wrong until we hit CTRL-L in the event before saving it. It pointed out that there was a syntax issue with 2 inline statements. Both of them were doing a SELECT INTO: y FROM xx_transaction, but then the where clause was referencing a different table, e.g. WHERE transaction.column = 'yaddayadda'. We fixed those SQL statements and everything was running normally again. 

It was difficult to find because all we could do was Edit Source, and that editor did not provide any messaging at all. It's a good sized window with 3 dozen controls and a lot of inherited objects. But we're up and running again!