Backing out WO-I by hitting F2 from the date field, selecting WO entry and answering Yes to the question about backing out the transaction has always worked fine... until now. It is getting caught in a weird serial number loop and not backing the transaction out completely. The quantity completed on the WO stays the same, but the W type transaction is reversed. The serial number remains available and the accounting looks funky. Plus, the transaction still show in the list in WO-I as completed. Plus, when you back out the transaction it goes into the process of recording the serial number again and you can't exit.  
 
What happened here?! I have a real mess on my hands. Started when we applied the July update a few weeks ago.

Received patch yesterday afternoon. Seems to be fixed.