What steps will reproduce the problem?
1. module:reload('muc') in the admin_telnet console
What is the expected output? What do you see instead?
I get a "cancel: not-allowed" error back after typing a message in a room on the component I just reloaded.
It would be nice to get some kind of warning in the muc itself that the service is reloading or restarting.
What version of the product are you using? On what operating system?
r8168+.45be94611593+-1 on Archlinux.
I am unable to reproduce this, can you provide a debug log and your configuration?