When in NES Dungeons, Cset9 isn't reloaded when you exit a passageway or item cellar. Only if you have Cset9 sprites will you see this effect. It seems to fix itself if you warp or go off screen.
Cset 9 Reload Bug.
This thread included a poll: Is a fix for this needed before 2.5 is released?
Is this still happening?
If cset9 was broken this would be one popular thread. Instead,
