So my game has a ton of UI elements, and I experienced one of the most annoying bugs a few days ago. I was editing a UI when I pressed ‘apply’ to apply it to a prefab, when then, suddenly, ALL of my UI elements IN THE ENTIRE SCENE got messed up, the position of EVERY SINGLE element got centered and their alignment got set to middle. I just about erased my project then and there, but instead I spent two entire days fixing every single one of my UIs. Then, just after I fixed them, I pressed apply on one of the prefabs, and IT HAPPENED AGAIN!
Yes, many times. Almost every UI element is centered (not panels though, but UI elements inside it). And it is really annoying since it happens at least once a day. Last one was couple of minutes ago or that’s when i noticed it. Still trying to figure out why this happens…
experiencing the same bug here. I’m 2017.3.0p1 on MacOS.
I have the same bug and I’m on 2017.3.0f3
I’m not sure but i think the bug is might be related to multiple canvases on scene. In my last message i said that “Almost every UI element are centered”, so not all and that made me think. I had two canvases that used same settings (not counting the canvases that used world space), so i dragged all the objects from one to another then deleted the first one. After that no bugs. Still not sure if that was causing it though…
I’m on 2017.3.0f3 too, and I noticed it seems to only happen when I apply changes to a prefab in my case. I’ve also got two canvases in my scene but unfortunately I can’t really combine them into one without breaking some stuff. Hopefully this gets fixed so I can actually work on my game again.
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I confirm this bug too. 2017.3.0f3, windows.
Have a similar bug too, I spawn the slots (buttons) for the bag in a grid, but with 2017.3 their positions are messed up and they all overlap on the same spot. The patch didn’t fix it, now I’m going back to 2017.2.1p1.
I know it’s hard work but I don’t really get how they menage to mess the UI up with almost every update.
I also have another bug, I have an audio source that plays sounds even if it’s muted.
Oh yeah i’m not the only one experiencing this 
I can confirm this bug for 2017.3.0f3 on windows
Hey as a note the bug this bug i believe has been fixed as of yesterday and its working its way through the review process so hopefully will land soon (cant comment on the exact version and who knows things may happen). Watch for a release note related to case 977959.
I can confirm it happens to 2017.3.0p1 (Windows) as well
Just ran into this. Took a while to figure out what was going on. It also affects hidden/disabled elements as well,
I have the same issue here, it doesn’t seem to follow any predictable pattern, sometimes everything behaves as expected and enabling disabling any component in the UI can make things start to lose their correct position at random, we are using Unity 2017.3.0f3 and Textmesh Pro 1.0.56.0b2.
@phil-Unity : The fix for this issue you were talking about is not up yet, correct?
Looks like it’s gonna be another week 
Same issue here. Made a serious mess of my project 
Yeah, and this morning’s patch release (2017.3.0p2) doesn’t list the bug as being fixed.
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That’s even more annoying. We’ve got a big update that’s scheduled for next month and this bug is a show stopper as I can’t edit anything without breaking the entire front end.
If I drop back to the last patch of Unity 2017.2, I’m guessing I won’t be able to take my 2017.3 updated project back to it? @phil-Unity : any workarounds for this?
I actually was able to downgrade to 2017.2.1p2 with my project that was upgraded to 2017.3.0p2. Aside from a couple of usual issues (like Android Gradle changes that seem to happen every. single. release), it was fine after the downgrade.