Just a heads-up for everyone:
I found out the hard way that Sudocue's canonicalization routine will choke (as in, program lockup with no warning or error message) if it encounters a puzzle string with no clues (all zeroes). I inadvertently had one of these in a puzzle collection file, and it took quite a bit of investigating to figure out why Sudocue was freezing only a short way through canonicalizing the collection.
I've sent a message to Ruud, but I would be surprised if it gets fixed. His interests seem to lie elsewhere these days, unfortunately.
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