"Show More" link not working

[pgh_pen]

When viewing a sellers items the category list on the left will have a "show more" link if they have items in a lot of categories.  Recently, this "show more" link stopped working.  It does nothing when clicked.

[ebooksdiva]

Try clearing your browser history and cookies. 
Or your browser may need updating. 

[de.duct]

It started working again.  Don't know what made it start working again.