I've also been having issues since the update. At first there was a lot of glitching out but now that the update has settled I only have one problem. If I have my MacBook HDMI connected to my monitor with different windows open on either one and then my computer goes to sleep, when I wake it up again the ones on the monitor are gone and only the main window I was using is open on my laptop. When I do the three finger swipe up to look at all my open tabs, they reappear as open on the second monitor but if I click on them it goes to the screen with no windows. This is the main problem I have right now. I've also had a problem where it'll only allow me to have one application on either screen at a time. For example, I always work with Spotify, Safari, and Premiere open at the same time, with Premiere on my laptop and the other two on the monitor. It would only let me have one of the three opened, as soon as I would open up the other it would immediately hide whatever I was last on. This problem occurred more so only at the beginning after the update happened. Third issue I've noticed is that sometimes when I have numerous windows pulled up between monitors, if I click on the Home Screen (outside of any window), it'll close the last one that I was using. Very weird stuff and also extremely annoying making it impossible to be productive. This issue also happened more so only at the beginning of the update. Solutions: At the very beginning of experiencing these issues I either had to restart/shut down my computer to fix it or unplug the HDMI and replug it in. Now, I've found that when it goes to sleep and all of the windows close except the main one, I just have to minimize that window and the rest show up behind it. I still have to drag them over to the monitor which is super annoying though. But this only happens when the screens go to sleep after a few minutes of inactivity. So it's not as big of an issue as it was right when the update took place. But it still isn't near-flawless like it was pre-update.