First, let me say thank you for all the hard work on this emulator! It's amazing.
I've had problems with the video scaling on my MacBook Pro. I'm running the latest MacOS (10.13.4) and using the most recent nightly build (5.0-6832 as of this posting, I've been trying them for over a month assuming this was a known problem and would probably be fixed in one)
Here's a quick screen recording of the issue:
https://www.dropbox.com/s/mk5oz698kkaotyt/ProblemX.mp4
My settings:
Internal Res: 2X, AA=None, Aniso=1x, PPE=Off
It comes up to the full size of the window correctly at first but if I resize the window or go fullscreen it shrinks down to the corner. I'm guessing this is an issue with Retina displays since it doesn't happen if I put Dolphin into "Low Resolution" mode. This behavior does not occur on the release version of Dolphin either. That works fine.
I've also noticed that the Save State and Load State function key shortcuts stopped working for me. I used to be able to hit FN+F1 on my MacBook to load slot 1 and FN+Shift+F1 to save slot 1. It now does nothing. 
edit: I found the Hotkey Settings.
Let me know if I should provide any further info. Thanks again!
I've had problems with the video scaling on my MacBook Pro. I'm running the latest MacOS (10.13.4) and using the most recent nightly build (5.0-6832 as of this posting, I've been trying them for over a month assuming this was a known problem and would probably be fixed in one)
Here's a quick screen recording of the issue:
https://www.dropbox.com/s/mk5oz698kkaotyt/ProblemX.mp4
My settings:
Internal Res: 2X, AA=None, Aniso=1x, PPE=Off
It comes up to the full size of the window correctly at first but if I resize the window or go fullscreen it shrinks down to the corner. I'm guessing this is an issue with Retina displays since it doesn't happen if I put Dolphin into "Low Resolution" mode. This behavior does not occur on the release version of Dolphin either. That works fine.

Let me know if I should provide any further info. Thanks again!