Some of you may notice that your 'useful' vote count has suddenly shrunk. People have not been changing their minds, rather I found a bug in the voting system which would sometimes count a vote twice (someone alerted me to this a while ago but I couldn't replicate it until now). I fixed the bug and cleared out the erroneous votes from the database.
Heh. I noticed that my useful rating had shrunk by about half so I was starting to wonder if I was half as useful as I thought I was! Don't tell my boss!