I was able to log into Zebra Codex. Have you tried signing in with a different browser or clearing your cache and cookies in your current browser and signing in again?
I did get a “Submission error: Creation failed” message when trying to submit an encounter. Is that the same issue John experienced?
I think the Sighting reporting issue may have been intermittent because now I’m able to report them normally without error messages. Let me know if you or John are still experiencing issues with Codex.