Your post made me slightly uneasy. That is a very long pause, time to do all kinds of things! Also the guy who posted the link hosted an image on a page with *censored* ads. Not a crime in itself, but still... I went to the extension writer's home page and it looks OK, but anyway BBCodeXtra 0.2.5.6 seems to have as many, if not more features...
Could the first one be malware or just badly coded?
Running an AVG scan just to be sure...