Maybe, you changed fixed_maintenance size from 16bit to 32bit, but didn't change node size, did you ?
Oops! Thank you for spotting that. I shall have to fix that for the next version. Thank you again for your error report!
Edit: Actually, I got home to find a message from Bernd Gabrial that he had fixed the problem himself, and forked my Github repository and added the fix there. Thank you very much indeed, Bernd, for saving me time in fixing the problem - I am very grateful! The fixes will be in the next version.