Did you try 3 progressbars in the default viewport (i.e. not defining any %V at all)?
I don't think that displaying 3 playbars in the main viewport was the plan of the wps change.As i recall, in the commit thread, it was said you could have three different playbars, maximal one per viewport..
Nevertheless even this code
%X|bg.bmp|
%pb|pb.bmp|0|10|206|23|
%pb|pb.bmp|0|100|206|23|
%pb|pb.bmp|0|200|206|23|
doesn't work. I maybe will commit this to the bugtracker, but i'd be glad if someone else did, because i'm not familiar with it at all.