I found a similar entry on the bug site but no solution -
FS#1143 - Configuration settings shows a blank page
.
My online version works so I suppose it has something to do with the offline servers and some alteration but what I can't imagine, especially when I reinstalled WAMP. I've no idea what has happened. I reinstalled WAMP and also JSAS (specially for Joomla). I can logon, access the Admin page, all other links in Admin work but when I click on Configuration Settings I get a blank page.
First theory might be wrong - I have another Dokuwiki test installation on the same server and all works well. So maybe a plugin? Disabled all - no luck!
Problem was the
bookmarkme plugin. It was working correctly but now not. I deleted it and now everything works. I can't think of a reason why it should interfere with the Admin Configuration page?