Sometimes, when we stop and restart MT4 quickly...... it does not 'see' the new files, so it does not compile them.

Popov created Forex Strategy Builder because he recognized that MT4 is a piece of crap, unfortunately, MT4 has not improved from being a piece of crap and that is probably why so many difficulties.

You can run CC Cleaner while your machine is running.

I have an idea that you need to reboot your system and if you do CC Cleaner I think you are going to see many, many registry errors that are causing you some grief.