I just ran across this new issue and wanted to let others know. As we all know IP addresses are harder and harder to come by. Recently I was in a meeting and an employee and myself could not view a large number of client websites, but everyone who had an Apple could view them. I figured out that the issue is with the program 'Malwarebytes Anti-Malware' which is included in almost all new Windows 7 PC's is blocking IP addresses of websites that have/had malware on them. SeoHosting.com recycled these IP addresses and assigned them to our websites. Our sites are free of malware and viruses but they are still being blocked by 'Malwarebytes Anti-Malware'. The next day two clients alerted us that they could not see their sites either. So it is worth downloading this program and making sure your sites are not being blocking cause if they are there is a lot of ppl who cannot see your sites. Not sure if this affects rankings at all cause Google does penalize sites with malware on them but not sure how they handle new sites on IP addresses that use to have a bad site on them. Anyways, this has caused a huge headache for me and SeoHosting is too stupid to understand what I am telling them. We are dropping Seohosting.com and moving to a new host, but I just wanted to let others know about this cause I have never heard this discussed previously and couldn't find anything about this in Google. I may be an idiot and everyone already knows this but I figured it if helps one person it is worth making a quick post.