Pro Tools 11 doesn't work,Sesions open then pro tools stop responding

[tronic21]

I have a macbook pro 2.6 ghz i5 8 gigs of ram
running Pro Tools 11.3.1

I try opening my existing sessions and pro tools stops responding
I try a new session and it stops responding

I have tried taking all plugins off my older sessions doesn't help
I have absolutely no clue what to do, maybe there is a preference that can be deleted or maybe a folder that needs deleting

I have also repaired my disk as well as the permissions

I'm stuck, if you can help me out that would be great

thank you