I have maybe a similar issue. I’m running Kstars 3.5.6 (stable) with indilib 1.9.3 (compiled from source just two hours ago) on Ubuntu 21.04. I just bought a QHY5L II C guide camera and want to test. Kstars has no problem in seeing the camera but if I move to live view I got the message indi_qhy_ccd crashed. The same thing happens after taking one 1s shot. I then tried with test_ccd_qhy but got segmentation fault, while if I run test_video_qhy I got no error.