It started happening at the same time I got the Corona Editor syntax error (like an hour ago), which required me to uninstall and re-install the Corona Editor package. But the plugin issue still remains. I’m still using the old Corona builds. I’ll give 3579 a shot.
EDIT: This was the Corona Editor error, which is resolved - Sublime no longer recognizes Corona Lua
EDIT2: Still same issue with plugins in build 3579