I hunted around a bit but I can't seem to find anything about this. At one point images in emails would display properly and now all I get for a link on the image in the email is 'about:blank' rather than the actual image.
I'm sure this is something I may have allowed at one point globally but I'm just wondering if after you click 'display images' should it load the images properly? Not sure if it's a posted bug fort 5GA or 5.0.1 but I figured I'd check. Again I'm sure its something I've missed or not done because this was working IIRC.