System editor/manager bug?

I can't seem to play my created systems. like, the "load" button for the systems when I'm launching the game is just greyed out. is that a point that we're at in the beta, or should I actually be able to do so? for a bit of background, I'm using the version of the game downloaded directly from steam. It's at beta v.56821
While we're here I've also noticed that there are a few features missing from the menu of my client that aren't from some of the videos I've been watching, like the replay feature. A screenshot of my client is attached to this post.

Sorry in advance if this question has already been answered, I just want to play the systems I've created.

Currently there is two limitations for systems you can play on:

• They shouldn't contain Lava planets
• They shouldn't contain planets with radius larger than 1200 meters.

Actually those features was in menu, but never work. So devs removed them from menu to not confuse anybody.