Running Synchron Pianos in Digital Performer 9.5 on macOS Mojave 10.4.2, if I have multiple instances of the plug-in, the status bar at the bottom is the same for all, which is kind of weird.
For instance, if I load the Steinway on one, and then the Yamaha on the other, the status bar on the Steinway instance updates to match the Yamaha instance, and vice-versa, regarding number of active voices and memory/samples.
This is with the latest Synchron Pianos update from a few days ago.
Also, certain focus events when going from other apps back to the DAW, cause either a reload or an update of the status bars (simultaneously, ending up matching the one that currently has mouse focus).
It is hard to know if it is actually reloading samples now that I have finished my careful incremental upgrades of macOS to Mojave, internal RAM (now 64 gB) and external storage (now a 2 TB SSD), as everything is so fast now.
But at least the two instances properly maintain the correct settings and piano reference.
Or maybe not, as I noticed just now that the Play page refreshes on the other instance to match the one currently given the mouse focus, so when you go back to it later, the settings are wrong and you have to reload your preset.