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In an animating room with 3 background animations, I have an interaction for
when player enters room (after fadein) that runs this dialog script

// dialog script file
@S  // dialog startup entry point
@1  // option 1
run-script 1
return
@2  // option 2
run-script 2
return
@3  // option 3
run-script 3
return
@4  // option 4
run-script 4
stop

In the global script I have
#sectionstart dialog_request //
function dialog_request(int parameter)
{
// 0 not a valid parameter
  if (parameter==1) {
      SetBackgroundFrame(1);
       //  SetBackgroundFrame(GetBackgroundFrame()+1);

     }
  if (parameter==2) {SetBackgroundFrame(2);}
  if (parameter==3) {SetBackgroundFrame(3);}
  if (parameter==4) {SetBackgroundFrame(0);}
}
#sectionend dialog_request//

Everything compiles and runs, but the only option that works correctly is #4.  The others all change the background, but never to the appropriate frame number.  For example, If I chose option 1, I pass a "1" to the dialog_request, and so expect to see background #1, but instead I will get something different. 

I get a compiler error (invalid parameter) if I use 0 as the parameter for
run-script.  I have a test in my global script (in dialog_request) for values
0 through 4.  If I simply change
run-script 0  to run-script 4 the compiler is happy.  Is zero not allowed?

It appears that the room editor modifies my graphic from 640x360 to 640x400 when I import it.  However, when I try to load via background animation another 640x360 graphic, I get an error message saying the background animation is 640x360 (which it actually is) and doesn't match the room background.  Consequently, I can't load any background animation graphics, even though every graphic I have is exactly the same size.  This happens with both .bmp and .pcx.  I've tried with game resolution at 640x480 and at 640x400, but the same thing happens.