For example, the existing page:
-wiki/bugs/__39__Existing_Subject__39___vs.___39__Browse__39__/
+ wiki/bugs/__39__Existing_Subject__39___vs.___39__Browse__39__/
displays the bug "'Existing Subject' vs. 'Browse'". But if we click 'Edit' on that page, we get:
-wiki/ikiwiki.cgi?page=bugs%2F'Existing%20Subject'%20vs.%20'Browse'&do=edit
+ wiki/ikiwiki.cgi?page=bugs%2F'Existing%20Subject'%20vs.%20'Browse'&do=edit
.. which of course opens with a blank edit box. Note that manually typing in the correct URL:
-wiki/ikiwiki.cgi?page=bugs%2F__39__Existing_Subject__39___vs.___39__Browse__39__&do=edit
+ wiki/ikiwiki.cgi?page=bugs%2F__39__Existing_Subject__39___vs.___39__Browse__39__&do=edit
does work.