You might also contact the developer of one or two of your plug ins to see what they can tell you.
Apparently the plugins are now required to be 64-bit architecture. So we're off to the waiting game for the developers to update their plugins. There is a 32-bit version of FileMaker Pro 14 for Windows, but only a 64-bit version for OS X.
There is a post below from FileMaker that says launching FileMaker Pro 14 from the Finder in OS X will run in 32-bit compatible mode, which I assumed 32-bit plugins would run. I tried it, but still no luck. I think we're 100% 64-bit on OS X with no 32-bit compatibility.
OK, finally figured out how to get 32-bit plugins to run on OS X. First, FileMaker only installs the 64-bit version on OS X. However, there is a compatibility mode available. To get FileMaker Pro 14 to run in 32-bit mode you have to do the following:
1. Quit FileMaker Pro 14 if it's currently open.
2. Navigate to the Applications folder.
3. Click the FileMaker app icon and choose File>Get Info.
4. Check the box to Open in 32-bit mode.
5. Restart FileMaker Pro 14 and your older 32-bit plugins should work.