ok, I always have that, its when a monster or something else touch each other at the start, or get stuck in the wall. can you see the monster or is it just the yeloow stuff? When it happens to me, the glowing stuff follows the monster (Cool, but bad).
Just make shure the monster isn't above an item or another monster.
BYEBYE.
BL, did you read any of the thread??.... I think everyone said that already