I recently created a temporary tag, as part of a clean-up project (june-2011-faq-revamp).
I went to edit the tag wiki to explain the purpose of the tag, by visiting this page:
As well as explaining that there is "There is no tag wiki for this tag … yet!" it provides a "Create Tag Wiki" button.
Clicking on the button redirects me to same page, with no form. I expected it to lead me to a page/form for me to edit the wiki-text.
Browser: Google Chrome 12.0.742.91