Software bugs or smaller technical problems can't be avoided running an online software. We are trying to always be up to date and adapt to browser updates as fast as possible. Please let us know if something doesn't work the way it should.
Refresh or restart your browser.
Go to browser settings and delete your browser cache.
If the error still occurs please get in touch with our support: firstname.lastname@example.org
To help us identify the problem, please attach a screenshot and let us know, which operation system and browser version you are using.