please help! -- F12: login disallowed upon changing shell from bash to tcsh

[Globe Trotter]

Hi,

I installed F12 from the LXDE spin and it came up all right. However, upon changing my login shell from bash to tcsh, I can no longer log in using the graphical desktop. Specifically I get the message: 

"Failed to execute login command"

After a day's worth of troubleshooting, I have tracked it down to changing the login shell from bash to tcsh. Any suggestions as to how i can have tcsh as well as be able to log in?

Btw, I am using slim because I am using the LXDE spin.

Any help is much appreciated!!

Best wishes,
T