I just has this answer accepted and the OP added a comment explaining what it was in the answer that helped him.
Seconds after my reply comment I then navigated to the main page and my rep had dropped by 15 - I had lost the accepted tick and the comment from the OP was gone.
Exactly what I did was leave the question open, then click on the question title to refresh - it was then that I saw the acceptance and the OPs comment.
Perhaps the OP just decided that I wasn't so helpful (fair enough), but I thought I'd highlight it here in case there is actually a bug.
Also - is meta actually the correct forum for bug reports?