Hi

Just recently I am having the following message appear when trying to upload files (pictures) not big ones to the file manager.

Upload Failed

Invalid form token. Please reload this form and submit again.

This seems to have just started, I cant find any other error messages, can edit pages, am signed in as admin and still getting the error. Also running 5.7.5.13

Anyone else having this issue/can shed light on the problem?

Thanks in advance