Hi Murphybro. Not sure what program you used in your original recovery effort but I can tell you that all recovery programs are not created equal. While they all will locate and recover deleted jpg's for example many do not retrieve critical data for the file such as Picture Width, Height, Resolution etc.
On the ones that will not display, right click on the picture, then on properties, then on summary, then on advanced. If there is no data shown on this page, this could be your problem.
I have ran controlled test with the following recovery programs (all free) Recuva, PC Inspector-File Recovery and Pandora. Only Pandora brought back this extra data necessary to display the pictures.
Perhaps you can run the recovery again using Pandora and see if this solves your problem
Let us know.