Another "Oops! We ran into some problems" report... can anyone help diagnose?

[joshg]

I have seen this error occasionally, and now several users reporting it to me.
I'm on XF 2.3 and everything up-to-date.

One user was able to get it reproducibly happening, it's always when he goes back to edit a previous post (permissions are all OK for him to do this).
Here are the console logs he grabbed when it last happened for him.

Code:

[Error] Failed to load resource: the server responded with a status of 403 () (draft, line 0)
[Error] Failed to load resource: the server responded with a...

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Another "Oops! We ran into some problems" report... can anyone help diagnose?

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