Well the movies help is a separate CHM file. So if it fixes it for the main help, that's great as I've solved the problem. Woo. And admittedly it didn't take me that long!
Why it happens... well I can only assume that HTML help editors act like debuggers, and they know something is up.
I'll introduce two new CHM files into the next build of X1, so that'll all be fixed then.
Thanks everyone.
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