I know, it's a little frustrating when you want to try out the new stuff.   What I'm doing, since I had already previously set up external runtimes, and still have Poser Pro on my drive....decided to try the method I saw in one of the other threads, an animation at this link that shows how to get one of the python scripts to recognize all the runtimes on your drive....go here and watch if this stuff sounds a bit technical to you:
http://shaderworks.rois-sorciers.com/tutorials/P8_firststart/
As you can see, part of what is being done in this animated demonstration is they are going up to scripts, partners, ShaderWorks, and then selecting import_runtimes...then it will ask something about "killing the scene"....which basically means it's going to force the program to shut down in order to make the changes.   Once Poser 8 can "recognize" all the external runtimes, then, if you have an older version of Poser still on your system, you can go set up your basic figure, props, whatever, just load it in any sort of way, save it as a scene, and then go to Poser 8 and open the scene and work with your content.   If you try to open a scene without running the python script, Poser 8 will ask to search for every single texture...and that gets old real quick....haha.   I know this is a round about way to get content into the program, but at least you can use it until a reasonable fix is established.    I tried the UI - Flex - html and swf thing....and it got me the same thing....a blank Library.   I see no way to get McAfee to recognize .swf or html specifically for permissions.   I remember seeing some sort of warning about blocking something during installation....it came and went and that was when it happened probably.   I guess turning off security altogether and reinstalling perhaps might work.    I've already tried five times, so I'm going to wait this out and just enjoy playing with what will work.   Hope this helps...

~skylab   : )