aww okay..

hmm..
The only other thing i can think of right now is, have you made sure that the box is checked under your settings?
(not sure if this makes a difference or not )

Under "My Profile" http://forums.psychcentral.com/usercp.php
Go to "Edit Options"
And then scroll down until you see "Thread display options"
Is the box checked next to "Show Images (including attached images and images in [IMG] code)" ?