Hi Giorgio, about 4 days ago, I was going to report this issue. I was seeing the "need to reload in order to operate on this tab" message very very often. I think I started getting the message while using a late 11.0.8 beta. At the time, I didn't report it because I saw 11.0.9rc2 had been released. So, decided to test and see what happens.
Whatever it was, was fixed in 11.0.9rc2. HTH.
This was the message.
Bo