Loading a game from within a game can sometimes load an empty system view (and also resets the music)

Description

I usually load the same game I'm playing from within that game to undo some unwanted action, or because I do something as a test and later want to step back. After the load, I usually end up in the main window with a empty system view: the hexes are there, but I can't see ships, planets, stars, warp points, etc... I believe it is a "painting" problem and everything is there, but invisible. I can address the problem switching to another system (as this forces a redraw) and then coming back, but early in the game is a more annoying problem because I only know one system and can't switch to another one, so I have to exit the game and loading it again

The music change tracks every time I save or load, too. Maybe that isn't a bug, but I think it would be better if saving would let the same track to continue, as in SEIV