Dear Catman,
Your Ip issue may be this..... there is another "cat-lover" (or CatSailor Member) in your subnet.
If your dialing into an ISP (Internet Service Provider), at the time of connection your PC is assigned IP (internet protocol) address. This address is assigned dynamicaly from the ISP. This allows the ISP to supply service to hundreds of users without having to purchase (and assign) a specific IP address to each and everyone of there users PC's.

Example: Yesterday you logged on to your ISP and received an IP address (dynamicaly) for your PC of 192.10.148.100, that is you IP address for that session. When you log off your ISP, that IP address goes back into the "DHCP IP pool". If I lived in you town and had the same ISP, I could log on right after you logged off and receive the same IP address - 192.10.148.100 - so if I logged on to "our ISP", logged on to CatSailor, voted from my assigned IP address, then I log off and you log in you may be using the same IP address..... and Mary dosen't want us to vote twice.
Now if your at work and your IP address is "static" and you don't assign IP addresses via DHCP (dynamiclly), then someone is using you PC and their going to the CatSailor website and voting - CALL YOUR SYSTEM ADMINISTRATOR AT ONCE - SECURITY BREACH!