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Hey guys, thx for the quick replies.

For Mr. Tom, yes that is what I meant was drag-n-dropping.  Couple of updates.  I did create a new test "project" where the size was 1024 x 1024.  So I dragged and dropped several other 1024 images and sure enough they happen to line up perfectly.  My project has a size of 7990 x 7750px (and each image will be exactly that size) so now I am wondering if PS may have issues if the size is not square?  Each image is approximately 180MB, of aerial imagery.

The other thing I noticed is that I clicked on all the snap options possible but the 'ALL' is greyed out and I cannot select that?  Oh, and I did try it with MS Explorer.  Same result.    Now I am thinking maybe as the project increases in size with each new layer the memory cannot keep up or something as each project can easily get up to 1.5 -2GB.

For ibclare - not sure I understand your commands or what I mean is what they would do?  Is that after I load all my layers, then use those commands to line up each image? If so, that would not work.  As I add each layer they need to be aligned from the get go.