I started getting this problem after sorting out some trouble with my HP scanner and reinstalling the software. However, I only get it with one website:

http://digiguide.tv/listings-grid/BBC+1+East/19+April+2012/11:00/

It's particularly irritating, because the error message comes up every time you click on any hotspot. I've subscribed to this telly guide, but I can no longer use it.