OK, thanks for giving that a shot – sounds like it did its job even if it didn’t directly impact on the problem at hand.
I do see that when you created the thread you noted having deactivated all other plugins and reverting to a default, unmodified theme – which are a solid set of troubleshooting steps, so thanks for giving them a try – but can you confirm if they had any impact on the problem and if you were consequently able to identify any conflicts with another plugin (or your theme) if so?
Thanks!