I am also seeing this and have found no other way to "contact the App Engine team" as noted. I've added myself to an issue, commenting and starring it, but no response over there either.
Just now in the logs from aprigoninjadev.appspot.com 2011-02-14 08:36:39.916 A serious problem was encountered with the process that handled this request, causing it to exit. This is likely to cause a new process to be used for the next request to your application. If you see this message frequently, you should contact the App Engine team. (Error code 203) -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
