variables from PHP won't load

I've spent hours trying to figure this out, and am completely baffled.

I've got a swf set to load variables from two PHP files. It will load from this one just fine
URL
but won't load from this one
URL

The PHP to create the name=value pairs is the same for both, and is obviously working. I checked for errors in the string by loading from a text file, and that works fine.

The only big difference is that they're on different servers. Is there some sort of server side security measure I'm unaware that would be causing the problem?
Any help would be greatly appreciated, as this project is dead in the water until I can get the variables to load.

The scripts must be on the same server as the .swf file - it's a built-in security measure.

Thanks, but I tried that too. It still does'nt work. It'll load from a txt file in the same directory on the same server, but not from the php file in the same directory on the same server.

At the start of your output in the second URL you have a lot of whitespace at the start, right before chkBox0=2. Try removing that, or starting the output with &chkBox0=2