Go to Tools, then Options, then click the Content tab on top. There's a button on the right side of the Load Images checkbox called "Exceptions." Click that and another window will open. Where it says "Address of web site:" type in
www.dsmstyle.com/forums and click the "Allow" button. Close all the windows, even the Firefox window and reopen Firefox. See if you can view images on style now. If not, try reinstalling Firefox. Sounds like some security settings are jacked and preventing you from viewing certain pics.