Good afternoon Stephan and welcome back!
Thank you for reaching out to us.
We apologize for the inconvenience caused by this glitch impacting the ability to leave comments with the latest version of Community Events.
We are actively working on a fix for this.
Unfortunately, I cannot commit to a release date for a fix at this point.
But you will be contacted as soon as there is one and release is a matter of days.
Thank you for your patience as we see this through.
In the meantime, the only know workaround is to downgrade Community Events to 4.3.2: https://theeventscalendar.com/knowledgebase/downgrading-plugin-past-version/
Best regards,
Geoff B.