I tried using the new vanilla mod last night and in the middle of the game the oddest thing happened - when I opened the city screen, instead of the normal view with info panes on the left and specialists on the right etc, I saw what looked like a minimal interface screen with only the top and bottom bars visible. In the middle instead of the left and right panels it was just more visible tiles around the city. I wasn't able to change specialists, or even tell how much happy/health the city had... Unfortunately I didn't think to take a screenshot
Anyway, I fixed it by turning the specialist stacker off, so maybe that bug hasn't entirely been fixed yet?