Okay, attempt at the icon fix.  

I tried opening just http://127.0.0.1 in Safari, and that didn't work.  Looks like Lion switched off Web Sharing.  Flipped it back on, and http://127.0.0.1 says "It works!" No place like home!

Entered http://127.0.0.1:11530/assets/addLibraryButton.png into Safari.  No love.  "Safari can't connect to the server.  Safari can't open the page "http://127.0.0.1:11530/assets/addLibraryButton.png" because Safari can't connect to the server "127.0.0.1".

I tried just http://127.0.0.1:11530, and I get the same error message.  http://127.0.0.1:80 works.  http://127.0.0.1/~paul (which is my user name) works... I get the "Your website" page from my Home "Sites" folder.

Checked the Firewall in the "Security & Privacy" settings.  It is off.

Tried Firefox and Google Chrome.  Can't connect that way, either.

Tried using my internal IP number instead of 127.0.0.1.  Same results as above: was able to connect to port 80, not to 11530.  Tried using the word localhost, same results as above.

I can see the PNG icons in Poser's Runtime/ui/Flex/ContentLibrary/assets folder, and the ui folder is fully populated with PSD's and XML's.