DORICO Playback stuck at hyper speed!

I have a crazy problem with Dorico Pro 3.5.12 and also 3.5.1 on MacOS 10.14.6. I am using an iMac 2017 i7 with 32 gigs RAM. All MIDI playback of my files seems to be set at some sort of hyper-Vivace tempo no matter what the tempo setting actually is. There is some sort of stumble over the first bars played too. I am using NotePerformer and Pianoteq etc…So far I have not been able to find a solution through emptying the cache or similar. Does anyone have any idea what could be wrong? Could it be related to the MIDI drivers on the MacOS?
Thanks for the help, Paul

Hi Paul!
Is this behavior related to a certain project (in which case, post it here) or does it behave like that on every project ?

and in particular are some or all of these imported MIDI/MuiscXMLfiles with perhaps a separate tempo track or something like that?