Do you lose the 15 pts if someone later unaccepts your answer?

Question

Do you lose the 15 pts if someone later unaccepts your answer?

Answer 1

Yes you do lose points.

Answer 2

Yes, and unfortunately this is one of the instances where it's quite difficult to determine exactly which answer you lost the points for. The best way I know of is to keep a page open containing a list of your accepted answers (from the envelope page, for example), and compare it to the post-unaccepted status page.