I am working on a GFX APO and I can load it on my development machine without issues (driver loads and property page loads). However when I put it on my test machine the APO shows up in Device Manager with the standard Windows HD Audio driver without problem codes, but I cannot see my System Effects property page. I rolled back to the Swap sample and it does the same thing. I am using 64 bit for both platforms (compiling for Windows Vista, loading on Windows 8), but the audio devices for each platform is different. It seems the key here is getting the endpoint correct - I'm pretty certain that ths is right (on my development machine it is eHeadphoneWave and eHeadphoneTopo, on the test machine it is eSpeakerWave and eSpeakerTopo). If I load it on other endpoints I can see the Enhancements audio tab, but when I load it on the eSpeakerXXX endpoint it shows no property page for effects at all. This tells me it's restricting the load of the generic APO, but is failing during my APO's loading process. I've added debug messages to the APO and Property Page DLLs, and it looks like they might not even be loading at all. I'm looking for some suggestions on where I might continue to debug this problem. Thanks! Preston