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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.
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What code did you add to the template?

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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.
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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).