I uninstalled the HighSlide mod from the forum.. This is the modification that causes pictures to zoom in and out when you click on them. Its a really nice feature if you don't have a lot of screen real estate; it zooms images to the max size of your browser. Without it, you click an attachment, wait a moment, and it displays full size even if full size is twice the width of your screen.
However, some folks were having problem modifying their posts with it. I'm going to post the problem to the developer of the mod to see if there is any work around or fix coming. Until then.. lets see if we can live without the mod.