Hi Dave,
I don’t know whether it is related to your issue: for cameras manufactured by ZWO, we have to revert to an older ASCOM camera driver in order to be able to use the feature of changing the offset setting within a sequence and get the FITS keyword OFFSET written to the FITS header. See Unable to set Offset in event settings via ASCOM (ASI 2600MM Pro) and Latest ZWO ASCOM driver isn't supporting offset correctly - ZWO User Forum .
The old QHY forum doesn’t seem to exist any longer, please read the text at https://www.qhyccd.com/warranty/ . For temporary use the URL of the forum (with some limitations) has changed to https://bbs.qhyccd.com.cn/ .
Bernd