Hi Mark,
I'll send up the screenshot tomorrow of the 2D projection settings for the map on the computer which doesn't have geotagged photo's heading south (about 100m). You'll see they're identical.
By the way, wouldn't setting the projection to none mean that the base map World Imagery would no longer align with all our layers which are in RD_New?
I had this problem when we first started with AGX and contacted ESRI Netherlands. They sent me a detailed explanation and screenshots of how to set the projection to fix this. Hence the settings in my screenshots.