I found that in trigger mode, if the delay value is changed to anything other than 440us, the camera frozes and becomes DEADBEEF next time I open IC Control.

Here is the steps that you can replicate the error (I can do this on both of my DFK 21UP031 cameras)

1. Open IC and a camera
2. Go to Property->Special and make sure the value of Delay is 440.00 us
3. Put the camera in Trigger mode and test it an external signal
4. make sure the camera works under current settings.
5. Go back to step 2 and change the value of Delay to anything other than 440us
6. Retrigger the camera with a signal
7. No updates from the camera at all, and if you try to bring the cam to freerun IC Control freezes
8. Close IC Control from task manager and reopen it, notice the camera's serial number is DEADBEEF

I am not sure if it's because I didn't use it correctly or it's a bug somewhere in your application/camera.