Okay, I've made some more experiments, just to be sure the problem is not the display.
I removed the DL-connected display and instead moved my regular 2nd display from the Mini-DisplayPort on the laptop to the HDMI port on the DisplayLink dock.
Still the same result: For a couple of seconds my desktop is shown, then X seems to be knocked over by something and I am returned to the lightdm login screen to start a new session.
Also, disregard my comment about the times of the crash files. I thought a separate file was generated per crash, but it seems they are accumulated. I've attached new crash-files (but the X crash file has shrunk, so you may still also want to look at the previous files).
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