Virus warning messages on the CFC forums?

While talking to a voting member tonight I learned that some members are still getting virus error messages on the CFC forums. Who is getting these messages and what are the exact messages that you are getting? Which anti-malware programs are generating these messages.

I use various anti-malware solutions on different computers and have not seen any warning messages on either of the computers or the tablet that I use most frequently.

Is this a widespread problem?