I had seen this before but didn't pay much attention. It really came out when I got Voluptuous Vicky's Fitting Room. Most of the thumbs in the Pose Library were missing names. It's harder than hell to tell what you're doing without filenames! I installed the same stuff in Poser 4.03, and the filenames were there. The package didn't include png files. I used P3DO Explorer to convert the orignal rsr to png and copied over. That didn't help. Here's my final solution: 1.) Reorganize the Fitting Room Stuff according to categories, such as Anton's Clothes, DAZ Clothes, and Form, Shape, etc from there. 2.) Rename *all* the files to shorter names. You can see the results. Before and after. This is the most work I've ever had to invest in a product I bought! But the product should be worth it. 

I too saw the long filenames disappear when I got Pro Pack. It seemed to be solved in one of the Curious Labs Pro Pack updates. If anyone else has any problems with ProPack it could be solved in Service release 3, so its worth visiting CLs site. (link at top of page)

SR3 Solved the problem for me, unfortunately it also screwed up my Victoria Changing Ponytail Expansion, showing all the morphs dials and not doing any of the morphs. I even re-installed it to make sure I hadn't screwed up the cr2 somehow... No go its the Service pack. So had to go back to using SR2 and dealing with the long filename problem. Anyone got a clue about the problem with the Ponytail and SR3, I'd be glad to hear it.