I have trouble saving edits in Visual Editor at (at least) Wikimania2016wiki. The problem exists a few weeks at least (I mentioned this a while back to James too - adding in cc), and I can reproduce it, but I don't have the problem on all pages:
- go to a page like https://wikimania2016.wikimedia.org/wiki/Accommodation or https://wikimania2016.wikimedia.org/wiki/Volunteer
- Click 'edit'
- edit in VE
- click 'save'
- fill out summary or not
- click save again
- The page that is displayed now, does not contain the edit
- saving through source does work fine.
- a page that does save edits: https://wikimania2016.wikimedia.org/wiki/User:Effeietsanders/test and https://wikimania2016.wikimedia.org/wiki/User:Effeietsanders/test2
I have the problem in Chrome (logged in) and in Edge (anonymous).