I have been noticing a lot lately this problem; for example look at the image in the op's post here:
http://www.makehumancommunity.org/forum/viewtopic.php?f=16&t=11935
I only see maybe the left third of the image "unless" i manually resize my browser.
I think this is something the forum software does to show the image at actual size and then just cut off the right-most side that extends past the current browser width.
I recently got my monitor on it's side for programming purposes ( helps to see much more of your code at once ) and every since, i have noticed this issue much more.
is there some way of telling the forum software ( like in my user control panel ) to just shrink images to fit --or-- make a horizontal-scrollbar?
edit: I use FF and i use the "prosilver" forum theme as most of the programs i work with are all light-themed so i try to choose light themes for everything i use to prevent headaches going back and forth....