UPDATE:

Looks like all the grouping got snaggled up, so I'll have to rebuild the affected navbars. And then try to convince the artist who maintains this site that she needs to be even more careful about touching the navbars.

So the problem is solved, albeit with quite a bit of drudgery left to do.

Any suggestions on how to prevent accidental mods to navbars would be helpful.

Thanks for the feedback,

Allen