I created a wiki page with the name 'Milestones'. I was able to access the page without any issues.
Then later modified the name to Milestones/Releases, and now whenever I try to access the access the page using the URL: https://sourceforge.net/p/delphinus/wiki/Milestones/Roadmap/ I get a 404 error.
Check out the link for 'Milestones/Roadmap' here:
So, two things here:
1) Can we help recover that page somehow?
2) We should not accept characters that are going to have problems as wiki page names.