Tested more on Sunday and all good. Very stable. Even tried some old SBS 50Hz TV captures provided changed the interface to 50Hz.
Been quite a few weeks, what with my Valerian getting an update to fix Full 3D finally (and resetting zoom to be perfect), this great test build, edge264-mvc decoding MVC on Linux and possibility of an ffmpeg solution in future. Happy 3D days for us fans. Always nice to have options as the HW decoding is fading away.