Probably been answered somewhere ... but, I'm playing beat the clock (who isn't?) ... and gotta find a solution or work-around, and FAST.
PREMIERE CS4 WON'T EXPORT TO ADOBE MEDIA ENCODER.
It goes through the motions; but never actually loads the elements to render. It just hangs after you tell it to "Start Queue." "Loading (project name)" just sits there, and I eventually get a "non responsive program" notice.
I'm running 4.0.2.002.
My usual work-around is to take the project into AE and render there ... but, this is a multi-camera project and they don't enport to AE.
Have you tried not exporting from Premiere but instead just open AME and under "File" select "Add Add Premiere Pro Sequence". When you locate your project file click on it and a short time later in the right hand pane it will show your "Sequence 01" click on it and then OK. Then choose your encoding format, preset, and output location also if you do not like the preset click on "Settings".
Give that a try.