I feel stupid, but I have another problem now after updating MusicBee and downloading again your skin.No need to doubt yourself. Concerning skins and skinning, both MusicBee and my skins are works in progress for v3.1 at the moment.
Now the progress bar is cut and isn't displayed correctly, look here what I get:
I updated the skin to (probably) fix the latest issue you mentioned. Same download link.
What a relief to hear such thing, I though I was abusing your patience, that's why I was feeling stupid and everything, I'm happy to see I'm a pain to read for you.
Your fix works great, concerning me, there's no more problem, so thank you a lot for you consideration about my reports, but since I saw two other things by now I will report mostly for you since they aren't much a big deal for me.
1 - It isn't very important, but there's a slight problem (I think) with the beginning of the progress bar, sorry if it isn't a problem, I'm basing my opinion on your first screenshot where I don't see this, but maybe it's because I'm on a full HD screen or something, I don't know, here's the screenshot.
2 - By updating MusicBee, I saw now you can switch between the progress bar and a wave bar, but the wave bar is green.
Sorry to repeat it, but thanks for being that quick, effective and sympathetic in your answers, I appreciate a lot.