Converting your object into collision object using collisionsource and bringing it into dops with source volume set to collision and scale source volume to -1 makes collisions usually work. I have a cluster setup and doing this same technique - only my fluid source is showing in sim.As in there is no smoke actually being emitted, any1 had this problem?..

other thread
http://forums.odforce.net/topic/21674-colliding-with-pyro-clustered-smoke/#comment-159184 [forums.odforce.net]
http://forums.odforce.net/topic/27889-pyro-clusters-collisions/#comment-159183 [forums.odforce.net]

Correct collisions with for cluster setup anyone? sorry if I'm annoying but I have 3 months to finish a junior demo and this is halting me for 2 days, there is no docs for this problem or threads. I cant figure it out