Upgrading R causes Tinn-R to freeze.

I recently upgraded from 2.8.0 to 2.8.1 by first installing the 2.8.1 version then copying the binaries and the library to the 2.8.0 folder. Now Tinn-R will not start up. I just see that start up splash screen for a long period of time. It seems fozen to me. Any guesses on what I did wrong in the upgrade?

Thank you.

Kevin