I think there is a bug with page caching and gd star rating not updating on post pages(or anywhere else you render ratings). I have seen someone else has posted on the GD star forum about this problem with no reply. It doesnt seem to be a problem with GD star at all as I have tried disabling almost all options in gd-star without success. The cache support in the GD star plugin only gets cached and all post pages just show the GD star loading... icon. I have tried adding all gd_ queries and have also tried removing post_meta objects. The only thing that seems to work is disabling page cache.
Has anyone else come across this problem?