tabs closing
There seems to be a bug where a tab will close that the user has not told Adobe to close. This occurs when a user has one tab open (tab 1), then 2 further tabs are opened, so a total of 3 are now open. By default, the third of these tabs will be the one displayed as this was the last file opened, which is fine. However, if you then click the 'x' on tab 1, without first viewing the other newly opened tab (tab 2), both tab 1 and tab 2 will close.
Please let me know if you need any further details. If struggling to replicate, I could provide a screen recording. This doesn't appear to be a 'one off' error, this happens 100% of the time since the new Adobe has launched.