Hi Frederick,
Thanks for posting – though I’m sorry to hear you’ve hit up against some snags.
To assign terms from the event category taxonomy the edit_tribe_events capability is required, however we don’t enforce anything unusual merely for reading them and WordPress defaults are used. Can you shed any more light on what led you to this conclusion – what capabilities do your custom user roles have?
it loads for a minute and then comes up with a red box that says “Loading Failed.”
This sounds like something that would happen if an unexpected or malformed response comes back from the server; I wonder – do you have WP_DEBUG enabled and might PHP warnings or notices be “polluting” the response?