I bet you're right. I guess I'll just have to develop the habit of pressing something on the remote to exit any screensaver mode before deleting the channel.
As an aside - I used to just upload the new version each time (to overwrite the existing version), but some time in the last year or two that started leading to occasional "memory full" errors (more frequent on some models and less on others but always inevitable), so I adopted the habit of always deleting the existing channel first, and I've never had that problem since.
Since you're OK with the black screen, it would take a few minutes to add that as an internal screensaver, and then you'd never have to remember. Plus, you could add a logo flying around at a later time.
I had that memory problem too, but it was only with Scenegraph. When working on a 2d channel, it never happened. (4200)