I tried TCringer as a demo. Configured ringers for both known and unknown caller. Worked for awhile but I now can't configure known caller. It just rings known caller with Sparkle ringer and no amount of selecting other ringers will help. Also, the tones that I added now show up as locked system tones. I can't even get rid of them. Tried deleting TCringer too with all it's data. Nothing appears to help.

How do I start from the beginning with this?

Thanks ahead of time for any suggestions!