icon is red and green, should be bluish ?
You would think so, seems to be a bit of an oddity there.

Assuming you're using a desktop launcher?, if so the icon chosen there isn't what's used in the panel.

If you were to take /usr/share/pixmaps/mc.xpm, open it up in gimp and save somewhere as mc.xpm, then use that copy and replace the one in /usr/share... it would come up as expected in the launcher.
Why not sure.