Hi,
Sorry not much help here but i am also having the exact same problem. I am currently investigating it myself and if i find anything ill add it here, any input from others will be highly appreciated.
Edit: So far i have found fresh new created projects are working fine and run without problems but projects that have been created in earlier versions seem to give me access denied issues. I get the same results using local drives, USB sticks and network drives but still investigating.
Thanks!