I am having troubles with MOS, I made adeafult install and when tweaking my panel settings after one of the reboots, I got the following scrambled dock (see at the bottom of the screen grab).
Upon boot, no panel is visible, but whenever I drag any window over that area, the trail gets drawn right where the dock was supposed to be.
Debug log could be interesting to read. Maybe send your panel config to me if you dare.