I'm not sure if it's some setting I've tripped, or if iFly is confused.  In any case, I now have a purple donut around my home airport, with the runway visible in the center.  Also, the center isn't smoothly drawn, it consists of short segments of connected lines.  Think pentagon inside a donut, only with more points.
Anyway, it's pretty annoying, and I can't find (or think of any reason to have) a setting that would create something like this.  Do I need to re-install iFly, or just RTFM more carefully?  I have done a complete database update, no change.
Thanks,
Bob