Everything newer than TMT 5.0.1.114 is broken, getting worse with every newer build. Use older builds.
Thanks James, I'll try an older build to see how it does, but build 146 and Catalyst 12.8 was the first combo that played both 2D and 3D blurays without any stutter. Also it has better integration with MCE (no drive menus before playing and no black screen afterwards).
I will try though, it's probably a better compromise than not being able to play some discs, as long as it doesn't stutter of course.