Product View Expres never was able to correctly display assemblies that used familly table members. We tried to implement it but it just wasn't worth the hassel.
About all you can do is download the lastest version from PTC, install it, and hope for the best. No user servicable parts :+)
For the project I was tasked with providing visibility for I ended up dumping the top level assembly as a STEP file and then reading it into SolidWorks so people could use the SolidWorks free viewer. That's one place where SolidWorks kicks butt on PTC.
Conceptually the Product View Express idea is nice in that it provides cross platform support (i.e. you don't have to be running a Windoze box). Unfortunately the imlementation wasn't quite as elegant. We never could get it to work with Netscape over X-Windose.
Take a look at the E-Drawing module for Pro-E. Yes its a Solidworks product (sort of). But it works great. You dont have to create a step file. Just publish your pro file (prt, asm, or drw) and save it as the .edrw format.