Within mephisto's public/ directory, I execute dispatch.fcgi from the command line and see the following output:
/usr/local/lib/ruby/1.8/date/format.rb:593: superclass mismatch for class DateTime (TypeError)
from /usr/local/lib/ruby/1.8/date.rb:197:in `require'
from /usr/local/lib/ruby/1.8/date.rb:197
Interestingly, "mongrel_rails start" works. "script/server" fails with the same error message as above. Help!