by garfy » Sun Dec 16, 2018 10:11 am
I would suggest that you open a ticket with IK Official support here
https://www.ikmultimedia.com/contact-support/mi/Due to the age of TR3 (originally released 10 years ago) I would suspect some kind of incompatibility issue with the latest Logic and/or macOS, but they will be able to give you a definitive answer.
Hope that helps.
System Specs: 2012 Mac Mini 2.6 i7 & 2015 MBP 2.2 i7, 16GB RAM
macOS10.15.7 Logic 10.6.1 Reason 11
Various IK, NI, Waves, Softube, Eventide, XLN software
Focusrite 18i20 x 2, Novation ReMote 25SL