I hope this is the right place to report bugs with the PerlMonks site.
Recently runrig sent a message to me. In it he used [pad://] to link to his scratchpad. I found that if I was in my message inbox it linked to http://www.perlmonks.org/?node_id=108949;user=developers which is a node I don't have access to. From anywhere else on the site it links to his scratchpad. We experimented, and if you send a message with [pad://runrig] in it it will work anywhere on the site. I reproduced the bug by sending myself a message.
Given that I was in my Message Inbox so I could read runrig's message, this was somewhat annoying...
Update: Thanks for the quick fix!