If you can see which plugin is hanging PT, you can go to the plugins folder and drag the files out to the unused plugins folder(this does not uninstall them, but just makes Pro Tools ignore them). You should find both folders if you go C:Program Files>Common Files>Digidesign>DAE. Once there, you should see a folder named Plugins, and another named Plugins(unused). In the Plugins folder, there will be 2 files for each plugin(same name, different extension). You can drag the files out and drop in the unused folder (or the desktop or some other folder of your choosing). By doing this, Pro Tools will not load those plugins. I can think of a few reasons why they might hang, but since I don't know(or remember) which; maybe they need updating or maybe they are optional plugins that you need an iLok to make work.