I simply created a new profile, entered my soft limits, ports, motor setup, etc. And the exact same file now renders properly... but I sure would like to know how I made it happen in the first place.
To reproduce the problem you'll have to download the XML from the link in my first post. Load the FireballV90 profile at startup or you won't see the problem. But, again, the problem is gone so I'd hate to waste too much of anyone's time. If you do figure it out, please post. If I figure it out I'll do the same.
-- Fred