The Never Ending Battle with ProTools 10

Seems like every time I post on here I rant on how UN-happy I am with this program (and Avid)now (vs before I upgraded from v8). I'll apologize ahead of time. Still trying to get ProTools to work. I can't even get it to run anymore. Won't play even 1 track without the "Increase Buffer Size" error. Now it just stops responding. My question is I am going to remove the preferences again to try to limp through my current project but I'm not sure about the ".com.digidesign.mbox2.prefpane.plist" (located in Mac HD/Library/Preferences) The icon is a blank page instead of a page with plist. written on it) I use a MBOX 2 for portability when editing. I plan on doing a clean uninstall and reinstall when I'm done with this current project but I don't want to take any chances with it being worse, though at this point I might not have a choice. I am using a 2012 MacBook Pro with LaCie Thunderbolt External HD. I have been through EVERYTHING (I am an experienced user) and know that the problem is with the program, not the computer. ANY input would be greatly appreciated! I have NEVER dealt with a company with the lack of customer service as Avid. I have never had to PAY to Email a company when I had issues with their product after investing so much in it. I will never spend another penny with them! (Sorry...there's the rant I promised : / )