Merge to HDR Function Problems?

[babalo...@hotmail.com]

Having a problem with the Merge to HDR function. At the Merge to HDR
window I browse the folder I want, choose the images and Open them
which returns me to the Merge to HDR window where they are displayed in
the window, I hit OK and the process begins, however the thumbnails
show as blank white boxes during this process and at the end, after
returning to the Merge to HDR window and the Curves function runs I get
a window stating that there isn't enough Dynamic Range to produce a
photo, which makes sense because the images are blank white.

The images open fine in Bridge and PS CS2. I've tried entering the
sequence through Bridge and get the same result, I've chosen the images
from a folder On my Mac Desktop (a G4 running the latest OSX) and from
a folder in Finder>Pictures. I've tried RAW images converted to TIFFs
and I've tried JPEGS and still the blank white thumbnails come up.

Any suggestions?