findforum.net blacklisted by SiteAdvisor (McAfee)

My users have been reporting not being able to access my forum. I have checked on multiple systems, it works fine for me, but my Users fail to get to my forum. So I did a general check of what might be wrong (malware? hacked?) and found that "SiteAdvisor (McAfee)" seems to blacklist all findforum.net pages....
I don't know what else it might be.

What exactly happens when your members try to connect to your forum? If they get an message, what is the message?

They say the page doesn't load / can't be found and they are redirected here:
http://mystart.incredibar.com/MB131?a=6R8wGmwQX1

Another user using GoogleChrome simply gets the "could not find aldarath.findforum.net" error