Hi @jsy,
Sorry to hear that’s giving you trouble! I’ve had another report a while back about a stalled meshfilter from @eepeterson, but I haven’t had time to track it down yet. While it was very rare that a particle will get stuck, it did seem that it happened when the mesh boundaries aligned exactly with one of the geometric boundaries. Could you try nudging either the mesh or geometry boundaries a very small amount to see if this fixes your problem? It’d be nice to know if it’s the same issue or if there’s another bug we should look into.
Thanks!
Patrick