Hey @jhealy
Your post wasn't locked, I've merged the new thread in.
I'm struggling to replicate this and without any PHP errors it's tricky to know where the issue lies.
The only thing I can think is that there's a problem with your email parsing (assuming that's on) - are there any Cron errors for the email parse job (they're not logged to the normal php error log, you may need to send them to logger within the cron job and check syslog)?
Edit: A quicker and easier test - could also try suspending the email parser job temporarily to see if this is the issue.