[Freesurfer] Help with tkmedit

Hello,

I am brand new to this software (and command for that matter) and need some help. After installing all the software, when I enter tkmedit in the xterminal, I receive an error message that looks like this: X Error of failed request: BadRequest (invalid request code or no such operation)      Major opcode of failed request: 128 (Apple-DRI)      Minor opcode of failed request: 1 ()      Serial number of failed request: 16      Current serial number in output stream: 16

Interestingly, when I type in tksurfer, this works. So I'm not sure what I should do in order to get tkmedit to work! Any help would be great!

Thanks,

Sandy