So, having two open {start} tags and only one close {/start} messes things up. I still don't know what {start} does though. Is it anything inside square brackets I wonder...?
[myCrazyTag]In 1 tag [myCrazyTag] in 2 tags [/myCrazyTag]out of the 2nd tag
Note - testing swear filter / asterisking out swear words under the new system. I'm not typing any actual swear words, just asterisking them out. Spoilered anyhow.