Hover effects (background highlights or color changes) have quit working for Category titles and Category post links in the sidebar, although CSS was not changed.
We've tried everything we can think of. The links work fine and the "titles" appear (which are in the HTML). But no visual effects from the CSS work.
Oddly, if I re-name the ID as a class, it causes the links to underline like the rest of the sidebar, but still will not call up any CSS.
Could our recent WP upgrade be the reason?
I'd appreciate any advice about this.