Same error here, just posting, for awareness.  I also tried on 2 systems (one AMD one Intel and did clean installs). 

I am not sure if this matters but i tried a transaction with the new wallet, and the transaction failed claiming that the funds had already been spent in another wallet.  I then tried the same transaction in the old wallet (funds still showing available) and the transaction processed then became "unconfirmed for ~8 hours.  I did a clean install with the old wallet and the transaction was picked up and processed on the next block.  Not sure if this helps but its a weird behavior i figured you might want to know about.

I will pm you details if you are interested.