I absolutely love all you do, and I love working with Unreal on a PC.
However I also work on OSX, and I wonder if you do not test OSX before release, it’s most usual a matter of 10 minutes real life testing before one discover ‘This editions OSX bugs’ - every new Unreal has new very apparent OSX bugs.
Last time something as obvious as Cmd+Z did not work as Undo in the editor (Like; Undo - who uses that?), something that takes very little bug testing to discover.
In Version: 4.11.0-2927265
Variables cannot be renamed by ‘Right click → Menu → Rename’ in the ‘My blueprint’ window. (along with several similar smaller issues)
Search is not automatically focused after right clicking in a blank editor area (One of the most used features of all)
Moving about in the BP area often cause wild screen flicker for 1-2 frames (Takes 2 minutes to discover)
After working a short while things like blank tabs with no content starts to pop up over the other windows…
It’s really just a matter of using it in 10 minutes before one discovers the OSX bugs of every release.
I have taken the time to test the issues you are reporting, and have gone ahead and entered bugs for the issues I was able to reproduce.
UE-29042 - Unable to Rename Variables in Blueprints using the Right-Click Menu on Macs
UE-29024 - Search Field within Blueprint Graphs lose focus after Right-Clicking on Mac
UE-29045 - Viewport Flickers when opening a Blueprint and Setting it as a Docked Tab on El Capitan
These bug reports address the few issues you mentioned, however; I have not been able to reproduce the issue where windows and tabs begin opening over top of the other windows. If you have some steps for me to follow so I can reproduce the last issue you are mentioning that would be helpful.
We appreciate you taking the time to write this report, and we ask that you remain patient while we get these issues fixed and integrated into an upcoming hotfix or full engine release.