I'm having some trouble figuring out this one last problem I'm having. I have four active blogs on my MT installation. If a user signs in to comment, everything works beautifully on all of them. If they don't sign in, their comment receives the confirmation page and publishes to the entry but the main index page doesn't rebuild and no comment notification email is sent. The following error messages are what I get on the system activity's log, not the blog activity log.
--- Start Log Messages ---
Internal callback died with: Attempt to reload MT/TheSchwartz.pm aborted. Compilation failed in require at lib/MT/WeblogPublisher.pm line 2035.
Internal callback died with: Attempt to reload MT/TheSchwartz.pm aborted. Compilation failed in require at lib/MT/WeblogPublisher.pm line 2035.
Internal callback died with: Attempt to reload MT/TheSchwartz.pm aborted. Compilation failed in require at lib/MT/WeblogPublisher.pm line 2035.
Internal callback died with: Attempt to reload Digest/MD5.pm aborted. Compilation failed in require at /data/ ... /cgi-b in/mt/extlib/TheSchwartz.pm line 12. BEGIN failed--compilation aborted at /data/ ... /cgi-b in/mt/extlib/TheSchwartz.pm line 12. Compilation failed in require at (eval 353) line 2. ...propagated at /usr/lib64/perl5/5.12.4/base.pm line 94. BEGIN failed--compilation aborted at lib/MT/TheSchwartz.pm line 10. Compilation failed in require at lib/MT/WeblogPublisher.pm line 2035.
Comment on "Testing Zemanta" by Test. (IP: 74.170.133.76)
--- End Log Messages ---
The only thing I see is the "cgi-bin" path is listed as "cgi-b in" but I don't know where that path is coming from and why it's different if a user signs in or comments anonymously. Not even sure that's the problem. This was a totally clean install. A test blog I created gets the same error messages.
Any help would be greatly appreciated.
Rob
Reported on Movable Type 4.3

Is there a way to just bypass whatever this hangup is? Like I said, when a reader signs in, their comments work beautifully.
Hi Rob,
You may like to not accept anonymous comments and then rebuild your index templates, so that your JS template would be regenerated and illustrate the latest comments configuration changes.
Kind Regards,
Mihai Bocsaru
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I tried that. I don't want to force registration on my few readers.
I would suspect that there is a problem with a module not installed.
Try to load the mt-check.cgi script and see which modules are not installed.
Switching for a more movable type hosting provider would fix this automatically.
I'm also offering such a service.
It is described at:
http://www.pro-it-service.com/en/movabletype_hosting.html