Another update. It seems that the issue is happening in App Engine release 1.9.20. Some of the instances in my app are on this release, and others are on the previous 1.9.19. We didn't a full scan, but based on manual inspection it seems that all the errors are happening on requests that are on the 1.9.20 release.
-- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/218652b7-4f2f-489a-8971-c5e606561c8e%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
