[PrincessJessica]

Sounds like some IP verification/check is malfunctioning to me.

You could try rebooting your router to see if that fixes it (might be best logging out of GD first, and even clearing history & cookies).

An educated guess would be that you're using an IPv6 address though and the forum software/plugins are a little out-dated to cope with that. If not being able to rate threads really bothers you that can probably be turned off in your router settings (Google your specific router for instructions) although I'd recommend leaving it as is (assuming it is indeed an IPv6 issue). A nice comment is worth 1000 stars and messing around with router's is way OTT for something so minor, particularly as I'm far less than 100% certain my guess is right.

Otherwise using another network will very likely workaround the issue. A proxy or VPN (I'd recommend Cyberghost as a VPN, no clue about proxies but any free one will do the job) will mimic that nicely if physically using another network is a hassle.