Are you using an Image control or an OLE Frame control to display the images
on the report?

If you are using the standard Image control then place your code to set the
Picture property in the Print event NOT the Format event.

If you have any control's whose Borders are dots/dash etc., remove these and
reset the Border prop to a standard solid line.

Snapshot export will fail silently if you have an illegal character in the
output filename.

Finally, here is a previous post of mine on a relevant issue:

Have you turned off the Loading Image dialog?

If you do not stop the "Loading Image" Dialog via the Registry modification
you will run into two issues:

     1) Access can crash if you scroll through the reocrds too fast.

     2) When printing a Report, Access may run out of resources and be
unable to complete printing the report.

     Additionally, two issues in regards to the Registry modification
pointed to
     here http://www.mvps.org/access/api/api0038.htm

     1) The Registry key MUST be "No" NOT "no" or "NO"

     2) On systems with XP or on systems with more than one user account,
you  must add/modify the key in both HKEY_CURRENT_USER and
HKEY_LOCAL_MACHINE.