Cole,
Whereas my previous problem was that I could not access the shell within the RStudio instance provided via the Marketplace, I now find that (after closing out everything) and resubscribing to the Marketplace, I cannot access the server via EC2 Management Console or via the Marketplace.
I tried using: (1) a webpage with IP-address:8787 and (2) putty (with same IP-address. Not even a prompt.
Help appreciated. BTW, I have successfully used AWS via the EC2 Management Console before.