I've been having an issue where sometimes while moving in towns parts of the background would be "tearing" in a manner similar to when a PC game needs vertical synch enabled. Unfortunately I haven't been able to get a screenshot of it.
It doesn't happen all the time and it sometimes goes away randomly. It seems to happen more frequently as I've had the emulator open longer.
This is the Mac version 1.9.92 with all the graphics plugin settings at default.