That's interesting; I don't actually see the "Changing channel: ###" pop-up, though I did see it when using Test mode.
From what I'm seeing on the Edit Channels screen, everything seems to look OK (at least, based on your description). I've attached a screenshot of what I'm seeing in that lower-right window.
I also saw at the top of that screen that the "channel number" field was blank, so I tried filling it in with the number for that channel. It didn't work, so I restarted Media Center (and the Media Server, just in case) and again it didn't work.
EDIT: Fixed it! I went through the "Scan for channels" wizard again, and this time on the Scan Channels window I enabled the checkbox beside "Automatically fill 'Channel Number' field if available"... that seemed to do the trick. I completed the wizard, and everything is working as expected now. Thanks for your help!