hey, I was able to fix it!! It was the HC launcher that caused it. click the gear at the top of the HC launcher and go to "homecoming" and check the box that says "Reset graphics settings on on next run" - that worked for me!
I had the same exact issue and was able to fix it by going into the HC launcher and clicking the gear at the top, then selecting "Homecoming" and then checking the box "Reset graphics settings on the next run"
I hope this works for you too.
Well, I don't get any errors, but the UI is freakishly small and I cannot click anything on the power trays or chat, or anything! I rebooted but still not able to make it full size. Any ideas?