using an ftp program like FileZilla:
browse to the /image_cache/assests/images/pix/crop/wed-pic-05_w90_h90/wed-pic-05_11101223.jpg file on the server, right click and select File Permisions. Try chnaging the permissions level to 755 the try viewing the file again in a browser.
if that works, use File Zilla to change the permissions for the /image_cache/ folder, and set it to Recurse through all files and folders under it.
Then in dreamweaver, edit the webassist/caching/CachedResize_Image.php file
change line 229: