Really slow build times, and cannot cancel. Even for very simple levels

What’s really strange is that it worked before… I did install some plugins, and these issues cropped up, but even after I deleted all the plugins and started a new project, I’ve never seen it complete building even just a blank level with nothing but a sky sphere, atmos fog, and a directional light. Does anyone have any ideas what could be the issue? Is this one of those times I should reinstall the editor? I haven’t made anything worthwhile yet, it’s okay if I lose everything.

After you have built the light, take a look at Windows → Statistics → Lighting build info. You can sort it by Lighting Time and it will tell you what’s using up all your resources.