Hi,
I’ve different projects, but in just 1 project the settings are no more working and so I cannot change the export settings, or change meta tags, head content etc etc.
Any suggestion to solve this problem?
I would suggest you contact support directly (link on menu at top right), as this isn’t something typical that users would probably be able to help with.
The bugs team has promptly identified and fixed the problem.
Many thanks 
Glad to hear you got it all going again. Have fun with it and happy web building 