I checked today and found that the wrong nav bar is displaying on many of my ring sites.
I have several URLS registered to RING A.
I own RING A.
I also have a fewseveral URLs registered to RING B.
I do not own that ring - I am only a member.
The nav bar for RING B was displaying on all of my pages - those of my sites that are members of RING B and all my sites within RING A that I own.
Various management pages show that all associations are in place and correct.
In my case I found that if I re-saved the description data for my sites registered to RING A, that the proper nav bar for RING A then displayed on those pages.
In my case I only had a dozen or so pages to do this to but those with hundreds of pages might have a serious problem.
So far, the fix I did seems to be holding.
It seems the common denominator was the association of the ring Sites (URLs) with my Webring Account.
I'll keep an eye on things.