The weekly server scans have all been clear of any malware on the server.
I have not been able to reproduce this, but if anyone else observes the same issue, I would appreciate more details of what you clicked and where it sent you.
Most problems of this type are actually malware or browser addons/extension on the visitor's computer. The browser addons may not be removed by typical anti-virus programs, as they may have voluntarily been installed with some other program you intentionally downloaded.
Defintiely run any security software you may have. Then make sure to disable any or all of your internet browser Add-ons or Extensions. You can always re-enable them later. These extensions can be very tricky, and may only affect one or few websites you regularly visit, leading you to believe the problem is on the website itself.
To confirm this, you can also try a different browser on the same computer, or preferably on a different computer or device altogether.