[Chief Technician]

Originally Posted by musicman691

It's not PT causing the warning. It could be a plugin that's not 64 bit (what plugins are you running?).

This is not the case. Pro Tools Plug-In Compatibility Grid states Pro Tools 12 and above require plug-ins to be AAX format and 64-bit.

If you:

1. Switch to Finder
2. Press Command+Shift+U
3. Launch Activity Monitor

Do you see any processes whose Kind is listed as 32 bit? You may have to add the Kind column to the view.