Adlm, you nailed it! That was exactly what happened - not just namespaces, but literally the same asset caused it! Whew! That was a quick answer, and for that I thank you profusely!
I did a search/replace on every script I found UnityTools, and replaced with TNet.UnityTools - fixed everything.
Aren, before next update, could you do a quick search/replace for that, too? Just so we don't hit that on the next upgrade and those of us (namely me!)
with horribly short memory spans forget the fix?
I'm getting closer and closer to a "finished" (somewhat playable) project, and my scene/channel navigation system is coming up on my "to do" list. Would love to see what fun new updates you have been working on with TNet in conjunction with your newest game!