Can't save changes due to an error

[Michael Smith]

When I am trying to edit one page I get the error:

• Your request could not be processed because a required security token was not present in the request. You may need to re-submit the form or reload the page.

I've created a copy of the page and the copy can be edited.

Why this error occurs on the original page? Please, help. Confluence Version 7.10.1

Thank you

[Kishan Sharma]

Hi Michael, I think you might be running into a known issue, refer the bug here.

Have you tried a different browser to see if you are getting the same error ?