2.0.15 Multi Processor crash and other things...- mac

hi
installed 2.0.21
when i switch on multiproc, VL crashes immediately. With Multiproc off also very poor performance, Audio crackles, no midi sending to the helix, Cpu bar always red
only audio and midi files, no stacks, no layers, no vst plugins …
same project works in 2.0.14 well

win 11 HP elitebook 840 G6, 16 gb Ram

Andi