With version 3, when a track is started, a small gap is created in the left side of the progress bar fill element:

I tried a lot of things, and I can get rid of the gap when I make the progress button less wide, but that will affect, and cuts-off some pixels from the left side of the progress bar element, and this:

becomes this:

Maybe it's something in the xml file, but I tried lots of things and can't figure this out by myself.
(pm send with all relevant skin files in case you could look into this)