I had the same problem with blank page. My Problem was, that the "selected" image path wasn't the correct one which belongs to the 4.2.1 installation.
After changeing the apex-image path to the correct one, the listener works correctly
Same issue here
Listener running on Windows 7 32 bit with Java 7
Oracle 11g running on oracle linux 64 bit
APEX version 4.1
Does anyone know what I should be using as the APEX static image path? Do I need these files locally to the listener? Or can I get them via a URL?