[2minacdev]

In the right sidebar of the Forum Edit page, under Forum Attributes, I select a parent forum from the list. After pressing Update, the field switches back to -No parent-.

I tried to copy an existing subforum from the same parent with PA Duplicate but no copy is created.

No error messages.

What can I do?

Wordpress 5.5.1.
bbPress 2.6.5.
PHP: 7.3.20

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[Robin W]

In the right sidebar of the Forum Edit page, under Forum Attributes, I select a parent forum from the list. After pressing Update, the field switches back to -No parent-.

I cannot replicate this – forum parents are saved and can be switched back and forth.

it could be a theme or plugin issue

Themes

As a test switch to a default theme such as twentyfifteen, and see if this fixes.

Plugins

If that doesn’t work, also deactivate all plugins apart from bbpress and see if this fixes. if it does, re-enable one at a time to see which is causing the error.

If you cannot do this to your site (say because it is live) then use the ‘troubleshooting’ features of this plugin to let you test without affecting other users

Health Check & Troubleshooting

Then come back