Can’t locate object method “seek” via package “File::Temp” at /usr/lib/perl5/site_perl/5.8.8/MIME/ line 816.

The underlying problem is perl was updated and overwrote the “correct” version of File::Temp that you probably installed when setting up RT and forgot about. To fix this issue

cpan install File::Temp
/etc/init.d/httpd restart

MAKE SURE TO RESTART APACHE! I didn’t, and it cost me probably 2 hours of screwing around with it.

I’m posting this because
Didn’t really mention what the final working solution was.