I do no know why, but Cornerstone tab disappear from all pages. No way to edit any page by Cornerstone. Please help
Hello @krzysztofb50,
Thanks for asking and I am really sorry that Cornerstone is not working properly on your website.
You said that Cornerstone button is not showing on pages. Under X > Settings > Allowed Post Types please make sure Pages is selected. 
Another possibility is that some file might have got corrupted. Please try deactivating and delete Cornerstone from plugin from Plugins > Installed Plugins (doing so won’t delete the contents or pages). After that please visit X > Validation and doing so will install latest version of Cornerstone. Please open the pages and see if Cornerstone button is showing up or not.
If you still have problems kindly get back to us with the result of the steps above and URL/User/Pass of your WordPress dashboard using the Secure Note functionality of the post to follow up the case.
Thank you.
Works now. Thank you !
You’re most welcome.
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