I wanted to let you know that I found the answer elsewhere. By deleting the malfunctioning form (which was not needed anyway), I was able to get my return to transmit. Details are here: https://ttlc.intuit.com/community/state-taxes/discussion/re-virginia-form-502a/01/1919879/highlight/...
Hope this helps. TurboTax, please let the product folks know they need to fix the error in the next software update.
