A collission problem

I would normally never get into the situation where I was testing collisions between sprites. Each sprite would have a parent entity (a cube normally) with its alpha set to zero and that would be used to test collisions... there are two reasons for this: I don't trust sprites to behave like entities because they aren't normal entities (hence the separate scale command) and I like to divorce game mechanics from the graphics as much as possible.

EDIT: Oooh, also you didn't say if both entity types were in motion... that's a real problem in Blitz and might be what's causing you grief. I think the solution is to either run each type's collision on different updateworld()'s or fall back to entitydistance.