On this computer , I'm running Linux Mint 17.3 Cinnamon desktop. I've seen this problem for a long time. I did a complete re-install couple a weeks ago to be sure everything was clean. The symptoms disappear after a reboot but come back while visiting this site. I've also seen it with Ubuntu (2013) but chalked it up to something else. I came upon the libopenipmi0 package while in synaptic and wondered if something was happening after reading about some remote desktop issues, (black squares on desktop.) Oddly after removing libopenimpi0 package the problems ceased but so did all images (except for advertisements,) on the site. Also, I have NOT been able to replicate the issue by re-installing libopenipmi0, (what is this doing on my desktop anyway?) and all images are still gone.I'll see if it returns.