I’m guessing building the IDE version is very similar to Edit. I was trying to build Edit from scratch over the weekend to debug https://github.com/Komodo/KomodoEdit/issues/3905, but wasn’t able to get past compiling mozilla and pyxpcom. If you have any tips to get that working on Big Sur, I’d appreciate them. I’m guessing once you figure out the IDE startup issue, the close file issue will be there too. It might even be a similar thing. From what I could tell, it hangs when you try to open a popup or alert. Does IDE do that when first starting up? I don’t use IDE since my PHP codeintel updates aren’t ported yet. Maybe the login popup?