Storyline 2 not allowing me into my project

I keep getting a message "The file "branch_support_story" is being used by another process or you do not have the proper security permission to access this resource. I have rebooted twice, closed Storyline 2 in My Task manager, and am not sure what to try  next. 

Prior to this, my computer froze with this project open. But I am the only with access to work on this, so I am sure that no one else is in it. 

Help....please! :)

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