mobi compile no longer working

I’ve been formatting through Scrivener for the past few years. I didn’t have any issues with the switch to version 3 however after the most recent update, the .mobi compile no longer works. I’m not getting any error message, the status bar just “work” and never produces a file. I’ve waited it out for 30 minutes when usually it’s complete in 30 seconds. Any ideas on what could be going on?

I’d take a look at this thread, and work through the procedure described in my post.