I was planning to order a Linux Plesk based VPS, but when I asked my provider about an antivirus option, I was told that although Dr.Web is the recommended option, they donīt use it themselves in their reseller accounts, because they usually had sporadic communication issues.
Plesk 8 with Dr. Web is fine, especially in a Linux environment where there aren't many viruses. I'm not sure what your host is talking about, although we've been running Plesk 8 since its release and have not had any issues with Dr. Web.