Sim won't finish writing & can't resume books

The issue I'm having is that my sim sits down to write a book, the progress wheel fills up fully, but the book is never counted as finished. If I try to resume writing these books, I get a "fizzle out" sound and the direction disappears. This happens 4 out of 5 books with the odd one completing. 

I've tried repairing the game, changing the computers in build/buy, reloading the lot. The only other report thread that seemed to be the same or similar issue was marked "fixed" so I've started a new thread.