I just switched my website to a space hosted by Yahoo!.  I did a clean install of Icy Phoenix and installed the latest patch.  When I load my pictures from OTF or if I load them individually, no thumbnails are created for pictures that are larger than 500 kbs.  These same pictures were on my old board (phpBBXS) and displayed fine.  

I have PHP version 4.3.11
GD version 2.0.28

I've changed just about every setting relating to the album and thumbnails, and none of them make a difference.  I've e-mailed Yahoo! to see if it's something related to them.  I don't have any .Htaccess files on my site.  

I'm at a loss.  Does anyone have any suggestions?

***.gregski24.com