I'm guessing you probably have already contacted Alon and/or Liraz via the Hub Feedback button, but just in case you haven't (and/or for others who come across this post) that'd be the go.
The only other thing that I could suggest is try using a different browser. As you would probably know some have had issues at times with both IE & Chrome. AFAIK no one has reported issues with Firefox.
I have heard of others with the same issue but not sure on a fix
I'm guessing you probably have already contacted Alon and/or Liraz via the Hub Feedback button, but just in case you haven't (and/or for others who come across this post) that'd be the go.
The only other thing that I could suggest is try using a different browser. As you would probably know some have had issues at times with both IE & Chrome. AFAIK no one has reported issues with Firefox.