Hmm, I seem to be able to create channel groups fine with your database.
Are you doing the same thing as me? ie, go to the Settings->Channels screen, and clicked the Groups, then select a few channels on the left, drag them to the right, and it'll auto create a new group. Give it a name. Hit Ok, and it should have saved the channel group. Hit Groups again. You should see your group still listed.
the Group "All Channels" as the name strongly suggests, already contains all your channels - so adding a channel to All Channels will do zilch since it already contains all channels.
start by dragging a channel from the list on the left side into the white space on the right side and I will great a new channel group for you'
As mentioned above, "All Channels" is a special group that already contains all channels. You shouldn't be trying to add or remove anything from this group. Just create a new group.
OK. Now it works. Sorry I misunderstood. Originally, I think I created more groups though. On a somewhat related matter, it would help if the Group editor window would provide information about the channel: Description (when available), vertical resolution, etc.