Tried an imaging session last night with latest 3.6.8 Stable. All functions seemed to work fine - except for flat generation. The last three jobs in my sequence are flats on the three narrow-band filters. First one ran OK, but now every single attempt to generate a flat at all hangs KStars right after the "Turn light box light on..." The progress indicator in the lower right of the Capture Module says "Preparing..." I get the "force quit" dialog from Ubuntu after a short time. Curiously, the log warns about "Always Reset Sequence" enabled, but it is not enabled (screen shot). I have a FlipFlat and have the optical train set correctly (screen shot). If I remove the FlipFlat from the optical train config and close the cover and turn on the light manually, the sequence runs fine. Auto flat calibration and generation used to work great - was adding the cap and light to the optical train new for 3.6.8? Seems to be a significant issue there.

[2023-12-08T08:22:21.589 CST INFO ][   org.kde.kstars.ekos.capture] - "Warning: option \"Always Reset Sequence When Starting\" is enabled and resets the sequence counts."
[2023-12-08T08:22:21.590 CST INFO ][   org.kde.kstars.ekos.capture] - "Job requires 2.000-second Ha images, has 0/20 frames captured and will be processed."
[2023-12-08T08:22:21.592 CST INFO ][   org.kde.kstars.ekos.capture] - "Parking dust cap..."
[2023-12-08T08:22:21.593 CST INFO ][   org.kde.kstars.ekos.capture] - "Warning: temperature delta check is selected but autofocus process was not started."
[2023-12-08T08:22:22.767 CST INFO ][           org.kde.kstars.indi] - Flip Flat :  "[INFO] Cover closed. "
[2023-12-08T08:22:22.767 CST INFO ][   org.kde.kstars.ekos.capture] - "Dust cap parked."
[2023-12-08T08:22:22.768 CST INFO ][   org.kde.kstars.ekos.capture] - "Light box on."
[2023-12-08T08:22:22.769 CST INFO ][   org.kde.kstars.ekos.capture] - "Turn light box light on..."