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Thanks guys! :-)
I think I've isolated that particular USB issue, although fixing that one presents another, but the latter is less likely to be a problem.
I managed to get another 1.5hrs on M16 last night, but the seeing (and thus guiding) was terrible. RMS was frequently around 1"/px, same as the sampling rate. Interestingly enough, stacking those subs in didn't visually decrease sharpness.
I decided after imaging for 1.5hrs to try and gather some PE data, so I let that run for an hour only to realise I hadn't increased the PHD search area enough and it lost the star after less than one full worm cycle.
I think I'll try another night on M16 with some longer subs tonight and then move on to OIII.
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