What antimalware do you use and did it give any information what caused the block?
Here is virus total scan for my site, 65 out of 66 says it is clean site.
https://www.virustotal.com/url/1a9ab19aec93fafb7ab8c344cf550f40f1eb393d11942beff0602919b9178f9a/analysis/1448567656/
It could be any of these.
Your Malwarebytes malicious website blocking technology has blocked outgoing or incoming communication between your computer and a malicious Internet Protocol (IP) address. That's a good thing. This communication could be:
An attempt to download malware onto your computer
An attempt to redirect you to a malicious webpage
An attempt to deliver malicious advertising
These are only suggestions based on other sites I think.