We check this website, now mtb-bg.com is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is mtb-bg Down Right Now? - NO! mtb-bg is up!
If you have problem with access to site mtb-bg, and domain mtb-bg.com is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).