Paul, I did check out that section, yes. I did deactivate the MAS versions of the plugins and am using the AUs.
As mentioned, if I create a new DP project, I can instantiate VEP on the slave PC and play it normally, without problems. The new project will also play properly upon being closed and re-opened.
The problem comes into play only on old projects. Unfortunately it persists even after rolling back to 5.3.13407, which surprises me.
On opening old projects, VEP instances which lived on the slave PC now try to load on the master Mac, preventing the project from loading properly (particularly since, for instance, Kontakt instances from the PC aren't recognized on the Mac or vice versa. When the PC instance attempts to load on the Mac, I get the error message: "Errors occurred while loading plugins: Integrated: Vienna MIR Pro Equalizer (Could not create plugin) VST: Kontakt 5 (Could not create plugin)). It also happens when opening autosaves of the DP projects, which by definition had been working at the time of being autosaved.
Again, I am not using the MAS versions of the VEP plugins, but the AU. And the fact that new projects utilizing VEP instances on the slave PC function normally seems to disprove a network problem.
This has basically rendered all my projects un-openable. A pretty horrendous outcome. Your soonest help would be appreciated.
Network setup: Mac and PC, both running VEP server 5.3.13407, Netgear Prosafe GS105 (recently rebooted)
--Chuck