I think you need to adjust the privacy settings - See http://don.hoover.net/privacy.html for the guide. Look into Ad Blocking tab to uncheck the box for "Animation". If it does not help, try allowing private headers in the cookies tab.
It's by design not known issue. See http://forums.zonelabs.com/zonelabs/search?q=pictures for users postings
I use FF, hosts files and usually have no difficulty rendering pages. I installed ZA Pro today (no, I didn't win the lottery, I will go to FREE after my free 15 day trial is over!)
I noticed that many pages have trouble rendering. I need to refresh the page to get some pictures to appear. If I exit ZA and load the page in a new browser (not a refresh) the pages appear quickly.
Is this a known issue? If so, is there a workaround?