command line misbehavior of Lilypond 2.8.4 on XP

[Stephen]

I have experimented since I first brought up this problem, by installing 
both Lilypond 2.9.8 and 2.8.3 which both work in the cmd.exe box. So, I 
don't know why, but I think something is wrong with Lilypond 2.8.4. Doesn't 
anybody else have this problem?

Stephen