The install script removes the texis.cgi or texis immediately if the install fails, so that an unusable version isn't left lying around to confuse things. (Besides, you'd be more likely to get some sort of File Not Found error rather than Internal Server Error if the texis.cgi was missing when fetched.)
You can copy texis from the bin subdir of the install dir (/usr/local/morph3/bin/texis) to cgi-bin/texis.cgi and try fetching that URL yourself to see the error.
I had sysadmin set up a new virtual host and the same problem occurs.
Would someone be interested in getting access to this vhost so you can put your fingers on this problem?
just give me a private email address to send to and I'll get the access to you all.
Are these virtual hosts running in chroot'd environments or not?
Assuming that
YOURCGIDIR/texis.cgi -dump
works.
What are the ownerships and perms of texis.cgi?
ls -l YOURCGIDIR/texis.cgi
What's your install dir?
What are the ownership and permissions of that directory and the files in it?