Yeah, so far I've had to remove two duplicate posts from Networking caused by this issue....Rita saw the first attempt using Safari "hang" and so went to Firefox to submit, then found that both attempts had gone through.
I'm still seeing the "hang" on submission as of this morning, but it no longer generates an error response. Attempting to re-submit using Safari results in the ubb message that the submit button is disabled now because the post has already been submitted.
Hope this additional info is helpful.
