When I give something karma, it doesn't take away the link (ie I did - and - is still there when I reload) I click - again and obviously it gives an error. The values are being stored in the database however.
What code did you add to the template?
I also set the karma change to 1 instead of 5 to test it, and the post I voted on didn't disappear from the listing.
Setting it to one means that the second vote will change the karma level...if you only want one post to change it then set it to 0. (Its a bit misleading so I may update the plugin).