It seems like a long shot based on everything you've done, but have you tried installing R/RStudio as an administrator? This issue sounds at least nominally similar, and that's what fixed the freezing problem for the OP there.
It seems like a long shot based on everything you've done, but have you tried installing R/RStudio as an administrator? This issue sounds at least nominally similar, and that's what fixed the freezing problem for the OP there.