I personally never use this QR, but I'm testing a quest that does.
If Smart Scrolling is used, and you walk to the edge of a screen, where there is no screen above it (the edge of a DMAP), ZC instantly crashes. I know this at least affects walking UP. I haven;t tested other directions. If the Devs want a.qst file with this problem, i can send them one, in private, and note where, and how to replicate it 100% of the time.