I personally love the Pro Pack. And the reason I love it is related to the same reason you hate it I believe. In the non-proppack version, Poser uses the .rsr files that are stored with the .obj in order to load geometry faster. The catch is that anytime you replace the .obj, you have to quite Poser and delete the .rsr so that Poser can build a new .rsr based on the new .obj. With pro-pack, it just reads geometry straight from the .obj file. For me, this makes things so much easier when developing new characters... it's not a big fancy feature, but it's my personal favorite. The problems you described seem a little extreme. Make sure you install Pro-Pack on top of an un-patched version of Poser 4 and then get the latest patch (SR2) from curiouslabs.com and run that. Also, did you select the option for compressed cr2's? Hope this helps.