It was a similar issue for me. In my case, the script I was running that had the 3dttest++ command in it was calling an older (pre -clustsim) version of the program (for reasons I don't understand) when I ran it with "tcsh my_script.tcsh", but it ran the new version when I executed the script with "source my_script.tcsh". Changes were made to our servers recently that I believe are causing this issue to arise for me.
I'll suggest posting your entire 3dttest++ command for debugging the other error.
Edited 1 time(s). Last edit at 07/07/2016 12:17PM by Phil Burton.