I'm guessing you are running 3.7 or a later daily build. If so you'd need to put the %pb tag in a non-default viewport whereas it is currently in the default viewport.
%Vi(x,y,width,hight,-)
%pb(0,0,-,-,-)
I'd recommend to define viewports for text display and %pm as well. If you dont't, they have to appear in the default viewport, that is before the viewport the progress bar sits in.