I think R works by itself because it opens fine, but as a first time user I haven't tried any scripts.
I get this error message from a diagnostic run attempt:
[rdesktop] ERROR system error 60 (Operation timed out); OCCURRED AT: rstudio::core::Error rstudio::core::waitWithTimeout(const boost::function<WaitResult ()> &, int, int, int) /Users/rstudio/rstudio/src/cpp/core/WaitUtils.cpp:63