(I tried to use the feedack form, but it doesn't seem to work. If this is redundant, please let me know, and I will delete it. And I think it would be better for you to delete it after you acknowledge the problem, because it doesn't belong here)
I think a feature of the software that runs this answers site is actually a bug - It seems that if one's answer gets accepted, you receive 15 pts. So far, OK, But if the OP changes the accepted answer to another, it only takes out 5 pts from your karma. It may seem logical to keep some of the karma, because at a given moment in time, the answer seemed to be perfect. But the trouble starts when you switch accepted answer multiple times - every time it happens, you add (15-5=10pts).
You can see it here, on my profile http://answers.opencv.org/users/197/sammy/?sort=reputation
15 0How to enable vectorization in OpenCV? (6 mins ago) (Accepted again. 15pts again!!!)
10 0How to enable vectorization in OpenCV? (6 mins ago) (An upvote)
0 -5 How to enable vectorization in OpenCV? (16 mins ago) (Dis-accepted. Still have 10 pts)
15 0How to enable vectorization in OpenCV? (16 mins ago) (Got accepted. 15pts )
10 0How to enable vectorization in OpenCV? (16 mins ago) (Upvote)