PT 2019.6 at 96Khz mutes random regions

[Stephen Webster]

When running a 96Khz PT session i get the following....

Random regions do not play audio ( although i can see that the master fader level meters are playing the region, no audio is heard.

Several track meters don't show any level, only a peak level is intermittently displayed.

When the track meters on the playback channel display properly... random regions don't playback.

Short Pre roll... region A plays, regions B + C show level in the master fader but are not heard

Longer Pre roll... region A shows level in the master fader but is not heard, but regions B + C play.

Converting the session to 48Kz, problem solved

PT 2019.6
OSX 10.14.6
HDX1, MTRX, HDIO, Lynx 8, SYNC HD
Mac Pro 5.1, 12 Core, 52B RAM