[quote=@Ellri]
[noparse][b]Looks [i]like BBcodes still don't like tags being mixed together.[/b][/i][/noparse]
[/quote]
I think the current parser handles it better: it just passes invalid BBCode through un-rendered. It lets you perceive your mistakes.

It's tempting to try and spot the auto-reconciliation algorithm that works in this trivial case, outputting this:

[code][b]Looks[/b] [i][b]like BBcodes still don't like tags being mixed together.[/b][/i][/code]

But from my experience, directly messing with user-input causes much more headache than it ever solves. 

I think the solution is to point these issues out in the BBCode error system. Make it awesome. Highlight lines in a faint red when they have problems, and highlight the problem tag in a more powerful red. Show line-numbers and refer to them in the error output. Make each error clickable so that it auto-scrolls you to the problem site. Instead of hinting that "some tags may be aligned", enumerate them and the actual lines they're on.

Hard to imagine how amazing the guild will be the day I can justify building such a hard, polished, and technically-advanced feature. :lol