I accidentally deleted my C# tag, but when I re-added it and clicked on it to get a list of questions tagged C#, I noticed the
# was not URL encoded to
%23, so I only saw questions tagged
I was able to reproduce this (I use Google Chrome 5, if that is of significance). I noticed that my existing C# tag is encoded correctly, but any new tag added that contains
# is not encoded.
It also happens (as would be expected) with other characters such as