Physics objects sliding on top of connected modular meshes is unreliable

Right now I'm trying to create a modular level system where you can connect many parts in order to create a full level. However, I can't get the physics to work right when objects slide across the seams between the meshes. The meshes are 100% snapped to the grid in both Maya and Unity, but sometimes the physics objects can get stuck "between" two connected meshes, even though there's no gap between them. alt text

Does anyone know how to fix this? I tried both box colliders and mesh colliders, but none has worked so far

Try the box colliders, they are more reliable than mesh colliders in my experience. And you might want to over overlap instead of seam to seam. I had a similar issue with seam to seam, and slim objects can get pushed through.