The Google CSE team is obviously updating with some tweaked code, on the front-end of the Custom Search Engines (CSEs).
As a result, JURN’s custom “click to search button” has become a small generic-looking one done in .SVG code. This is smaller and tighter than I’d like, and has replaced JURN’s nice custom .JPG button.
This “click to search” button still works fine, so it’s only an aesthetic change…
I’ll leave it a few days before jiggling the CSS to try to get the custom button back, just in case Google decides to revert the changes.