Unable to delete private messages

[martbd]

The following error occurs when I try & delete private message.
The submitted form was invalid. Try submitting again.

[Gully]

The following error occurs when I try & delete private message.
The submitted form was invalid. Try submitting again.

Yes, I have noticed that as well.

A workaround is to open the message and click on the delete message icon. That works but of course only one at a time.