So,

Some progress on the crashes - it no longer crashes. Now it hangs instead. I get the infamous "The app is no longer responding - Wait or force quit" dialog.

The tail of the log is consistently this:

[2020-10-29T14:13:33.987 EDT DEBG ][ org.kde.kstars.ekos.guide] - Capturing frame...
[2020-10-29T14:13:35.427 EDT DEBG ][ org.kde.kstars.ekos.capture] - Autoguiding suspended until primary CCD chip completes downloading...
[2020-10-29T14:13:35.430 EDT DEBG ][ org.kde.kstars.ekos.capture] - Guiding state changed from "Guiding" to "Suspended"
[2020-10-29T14:13:35.430 EDT INFO ][ org.kde.kstars.ekos.guide] - "Guiding suspended."
[2020-10-29T14:13:35.431 EDT DEBG ][ org.kde.kstars.ekos.scheduler] - Guide State "Suspended"
[2020-10-29T14:13:35.462 EDT INFO ][ org.kde.kstars.indi] - "FITS" file saved to "/home/jeremy/FlipTest/Light/Luminance/FlipTest_Light_219.fits"
[2020-10-29T14:13:35.462 EDT DEBG ][ org.kde.kstars.fits] - Reading file buffer ( "11.6 MiB" )
[2020-10-29T14:13:35.627 EDT DEBG ][ org.kde.kstars.fits] - FITS HFR: 2.72458
[2020-10-29T14:13:36.001 EDT DEBG ][ org.kde.kstars.fits] - FITHistogram: JMIndex 0.999979
[2020-10-29T14:13:36.011 EDT INFO ][ org.kde.kstars.ekos.capture] - "Download Time: 0.58 s, New Download Time Estimate: 0.64 s."
[2020-10-29T14:13:36.091 EDT INFO ][ org.kde.kstars.ekos.capture] - "Received image 219 out of 600."
[2020-10-29T14:13:36.093 EDT INFO ][ org.kde.kstars.ekos.capture] - Resuming guiding...
[2020-10-29T14:13:36.094 EDT DEBG ][ org.kde.kstars.ekos.capture] - Guiding state changed from "Suspended" to "Guiding"
[2020-10-29T14:13:36.094 EDT INFO ][ org.kde.kstars.ekos.guide] - "Guiding resumed."
[2020-10-29T14:13:36.095 EDT DEBG ][ org.kde.kstars.ekos.guide] - Capturing frame...
[2020-10-29T14:13:36.095 EDT DEBG ][ org.kde.kstars.ekos.guide] - Received guide frame.
[2020-10-29T14:13:36.095 EDT DEBG ][ org.kde.kstars.ekos.guide] - Multistar: findTopStars 25
[2020-10-29T14:13:36.095 EDT DEBG ][ org.kde.kstars.fits] - Sextract with: "1-Default"
[2020-10-29T14:13:36.095 EDT DEBG ][ org.kde.kstars.fits] - Reading file buffer ( "289.7 KiB" )

Again this seems to be in the SEP guiding. It hangs trying to read the buffer.

J.

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