Mac OSX - Maverick
Double clicking a file in the project files area to the left adds the tab for that file to the workspace, but doesn't focus to that tab. I have to double click again.
Cntrl+click on a tab and elect to close others, or all or any of the other close options does nothing.
Clicking a tab won't show the files contents, but the tab is focused.
This version is extremely hard to use.