The architect has a way of turning white space into html-like markers. If this happens after the normal error check, you can overflow a field without getting the orange error warning.
I'd check all of your text fields and shorten any that look like they're riding up against the field size limit. See if giving an extra five space or so on each one makes the problem disappear.
Also, file a bug report using /bug.
I'm trying to publish an arc but I keep getting the error of "the field deathspeech exceeds the text limit"
Now ok that sounds like one of my bosses is saying something that is larger then the box, but I hav already gone through and looked and I couldn't find anything.
The part that really stinks is that it doesn't show up in the actual errors.
Has anyone ran into this problem, and fixed it?