My user says they cannot start a new thread, can only reply to others

One of the users of my server (hosted by says that when they start writing own toot, the “Toot” button is grayed out. The button is only active when replying to other people’s toots.

Has anyone else had this issue? Could you suggest me something to try to solve this problem? How can I (or Hugo, owner) somehow provide some useful debug info?

Thanks in advance.

I think I’d go to check with first…