I wonder if you have come up with a fix for the WP simple paypal shopping cart integrated into NextGen galleries? I am getting [Not a valid template] instead of the gallery and the paypal links.
I have upgraded to the newest version of NextGen (2.14), but it isn't working. Part of the problem is that there isn't a view folder to put the gallery-wp-eStore.php into and I'm not sure where else to put it. (and I have tried a few places with no luck)
I've searched everywhere and can't find a solution. In the meantime I may have to roll back to version 1.9.