You'll have to tell us how you stored them in older versions an din your new
version.
Ironically, Access 2007 is slightly better at native specialized image
storage than the older versions.
For 2003 and older, one problem with using OLE fields was exponential bloat
(far more than the image size, which is itself big) . Another was a
deception that it appeared that Access could show you images by just clicking
on the fields etc., but in reality such was dependent on other software in
Office who's presence is unreliable (comes and goes with Office version
etc.). My first guess is that this is your issue.
A solid approach for all version is to store the pictures in a separate
folder, store the location and file names in text fields, and use coder to
display the images in forms and reports.