Bob, I finally understand your pain as I decided to try out studio 4.5 and reality 2.5. The shaders do indeed disappear, even if the scenes were saved in the duf format prior to merging. Thankfully its not a Reality issue, its definitely a studio issue, as my test renders with shaders saved in separate folder libraries worked fine. 

Acsel on the other hand isn't liking 4.5 or something in the works, as I tried to load shaders from awhile back and something put a chokehold on my rig. Everything outside of studio works fine, but the hard drive sounds like someone dumped a pint of rocks into a blender. =( 

Paolo, if you happen to see this, I'm not sure if its an isolated issue with this particular image, but it looks like Reality is putting displacement maps into the bump slot and loosing the bump map altogether. (post acsel loading)

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