That's weird.. do some error message start appearing on the developer console (F12) when this problem happens?
No it simply just stopped making changes after awhile no error codes or nothing. And all I could do was play around with my half built ROM as reseting it didn't fix the bug either. No matter if add things or even delete code it still wouldn't update the build. But I'm definetly not too upset as the bug happened only a hour in and as you mentioned you've got a lot of things to do.
Good news: version 0.12.0 now has a panel at the bottom of the window, in order to display error messages:
https://haroldo-ok.itch.io/vcs-game-maker/devlog/645573/version-0120-is-now-avai...