This bug is somewhat difficult to describe, however I can describe how to replicate it.

1) launch novashell
2) run top view rpg test
3) click "new"
4) with arrows, run the goblin all the way across the different rooms.

Dont watch the goblin, watch the walls and floor.
What you see is 'smooth scrolling' punctuated by small stutters every second.

If you "go outside" it is more pronounced - watch the trees as you walk by them. It's like "boom boom boom" -- the scrolling is not smooth at all.

It's like the ui is "slipping" every second or so. Does anyone else see this?

I havent tried this on xp yet, but I'll update this if I do.