I was having a similar problem so here's my solution in case it helps anyone. I was getting a black screen with pointer if I booted up with the dock attached, but could plug in the dock afterwards and it would then work (sort of). For whatever reason my system seemed to think that there were two monitors when I only have one, so I right clicked on the desktop, went to "display settings", then selected "show only on 1" under "multiple displays". That seemed to fix the issue.
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