Latest version of RStudio is 1.2.1335, on the free downloads. This is the one that appears to load properly, taking the usual time to set up, but then not displaying the desktop but rather just the screen that was there before. No diagnostics or errror messages. Earlier I was advised to use a version from the archives and the couple I tried worked fne as far as I can tell. So the problem is not that NONE of the binaries work, but rather that only the newest one is the one giving me problems.