The progress of compiling of a epub of my project is stuck…any cues?
What I seen happen rarely is some sort of incompatibility where part of a file doesn’t get compiled, and usually an error is flagged in this process.
That may not be what you’re talking about, but in those cases, the way I have successfully fixed that problem is by divide and conquer.
In other words, cut the project in half. Uncheck half of the documents in the compiler and try again. If you still have a problem, cut the remaining documents in half. If you don’t, the problem is probably in the half that you didn’t compile the first time.
It can be laborious, but it can get things down to the point where a single document can be determined to be what is problematic.
And sometimes it’s just one line in a document, or maybe just one word, or maybe just one punctuation mark.
If you get it down to one document, you can divide that in half, using the same technique. If you keep doing that enough, you might even define where the error is in that document.
What you can do then is to copy the stuff that you know is good into a brand new document, retype the line that is the offender in that document, delete the old document, and try compiling again.
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Binary search for the win! 
A technique I’ve often used.
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