Since I've installed the 3/12 update, every Work Order I backflush is giving me "GL Posting is going to the clearing account".
 
Specifically, the appropriate Credits to the Inventory Account and corresponding Debit into the WIP account for backflushed items are getting the errors.

This helped me solve one of the problems we were having... with one caveat...
 
The problem "appeared" to be that the GL accounts were "changed" with the upgrade / update.  From what I can tell, that happened if the accounts were assigned in SM-C ?  (Lynn, please correct me if I am wrong!!).  They need to be assigned in AD...
 
Secondly... the account numbers need to be "pulled" in, NOT entered in.  I.E., you have to Lookup the account number, select it (highlight) and then hit it again, to Pull the account number into the corresponding field.  Simply entering in the account number in the field will not always work.  We've taken to ALWAYS pulling in GL account numbers into any field where they are needed and NEVER simply entering in the numbers (something which should be fixed, as it takes much more time!!).