Created attachment 77 [details]
gdb backtrace of pulseview 0.1.0

Hardware is Bus Pirate 3.5a, latest firmware from package v6.1. Data aquisition with sigrok-cli works with this device and gives the real state of the input pins.
When opening the device in pulseview, pulseview throws the message "QFormLayout: Cannot add null field to ".
Pulseview then shows the five input lines of the Bus Pirate.
The first run shows the actual signals at the input pins.
The next runs show not existing signals, that look like the signals from the demo device, except that there are only five digital lines shown.
When I switch to the demo device and then back to the Bus Pirate, it still shows only demo data.
When closing pulseview, the serial port (/dev/ttyUSB0 in my case) is still locked.