[KingFish]

I've run into this lots unfortunately.

the only work around i have found, it to make a folder called TEMP on the desktop.

in finder, navigate to System HD/Library/application support/Digidesign/plug-ins

and drag all of your plugins out of that folder, into the temp folder you've created on your desktop.

Load Pro-Tools
Load your session
Remove the italicised plugin causing the crash
Save session as sessionNameFixed
Quit Pro-tools
dump the plugins back where they belong (HD/Library/application support/Digidesign/plug-ins)
open your "Fixed session" insert a new instance of the plugin, and reset parameters the way you had em.

This happens for me with older sessions with Auto Tune, and ChannelStrip

Importing Session data, would crash PT, simply Re-saving the session after removing all the plugins, restoring the plugins, opening the session, and activating the plugins, would crash pro-tools.

The above meathod is really the only work around I have found for this in PTLE 6.4 and PT TDM 6.7

If you find another way, let us know about it.