I don't know if anyone else is having this problem, it is to do with the XDA Developers' site.
When I used to click on a picture in a posting, the site would show a medium grey layer on top of the site and this would show an enlarged picture with a X button at the top-right corner. If you clicked on this button, then the layer would dissapear and everything was back to normal.
Now when I click on a picture in a post the site has a medium grey layer sitting on top of the viewable (but unclickable) site. I don't see any picture and there is no X button. The only thing to do is to hit the Back button.
I can view the picture if I right-click on the picture and select to open it in a new tab.
I am using IE8 in WinXP. There is no pop-up block on this site.