Yep the crash was due to 500 shots reached - buffer overrun I guess. Craig has sorted it and launched PHD 1.8.1 on the stark-labs website.
Also I've asked him to compare MaximDL guiding to PHD - because on its default calibrated settings MaximDL seems to be 2-3 times more accurate (smaller star trails) then PHD on the same gear and targets, plus it shows RA and DEC drift very clearly as being random, small and at what rate they cycle. Hopefully Craig might intuit what they do better than him and improve how the already good PHD operates!
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