Images not loading on a certain website, were OK last week

Home wireless network, one laptop and one wired PC for Linksys E3000. Win7, HP dv7 dual core i5, NIS 2010 when the problem started. all opsys and programs up to date. Automatic updates for most programs and Opsys. Just over a week ago, I had no problems on the following site. http://safety-signs.compliancesigns.com/search?w=neighborhood+watch+signs 

 

The gif images loaded fine with both IE9 and Firefox 10.0.2.  All of a sudden they quit loading. I can load them from computers not on my home network. Note that this started at the same time on both computers.

 

I updated to NIS 2012 yesterday. Didn't help. I added Chrome just to check. All 3 browsers behave the same way. What can I do to try and narrow down the problem? I never had this one before and have exhausted what I know to do.