Can I get some people to test and see if they get the same results in this c3p?
...Before I make an entry in the bug tracker.
It appears to me that the initial outline on the text is overdrawn.
Just type some text into the text box and hit ok.
Leave the tab for 30 seconds, and then return, clear and repeat the steps.
On my end it appears to clear up the outline
dropbox.com/s/f0mfb7ntpijfksc/bbcodeOutline.c3p