Problems with 10.3 (macOS 10.4.6)

The 10.3 update doesn’t work well here, compared to 10.2. It begins with very long startup times, showing the beachball sometimes for minutes, 10.2 starts much faster - same plug in configuration etc. I work on stereo, surround and VR content. Recently I switched in a stereo project to my surround output configuration and 10.3 crashed - never had something like this before. Later this worked, but I couldn’t change the output of some channels to my surround outputs (I use 8x 5.1 channels going into my DM2000 desk). N 10.3 just left the field blank - of course the outputs were working with other channels and connected to hardware outputs. Changing to 10.2 with the same project shows no problems like that whatsoever.
N 10.3 just feels fragile in comparison to 10.2. (HexCore MacPro, macOS 10.4.6)


Could you attach the *.crash file, please?

Mac: macOS Console utility > User Reports folder (or ~user/Library/Logs/Diagnostic Reports).