Post can't be edited

For some reason, this user cannot update their posts on this thread, even though neither their account nor the post locked:

Any ideas what could be causing this?

Is it very old? There is a limit on how long posts can be edited, to prevent weirdness around editing in spam to very old posts by a compromised account – you can adjust this time interval in site settings.


Awesome! I found the setting. As always, thank you for your fast help!