I just spent a couple of days trying to figure out why after updating
to your version 1.13.1 of Crayon Syntax, the "<>" toolbar code button wouldn't work anymore. When I clicked on it, nothing happened. I finally decided to try in another browser that I never use(IE), and it worked fine. So, on a hunch, I went into the offending browser, Chrome, and cleared the cache, and cookies and that fixed it. Just wanted to post this in case someone else has the same problem.
Thanks for your hard work on this awesome plugin!!!