Somehow the new version had too many changes and I somehow created an endless loop which refuses to allow the game to load.
I will be looking at it more closely, but for the time being I am rolling the testing branch back to the last working version 0.4.7.
This uses the old save load system and the old star chart. It does not have some of the recent improvements like backing away from planets and better aiming towards stars and such. Those things were not dependent on the newer save/load system, so if I cannot get the latest version working, I will re-introduce those improvements in this branch.
Sorry about all this, it seemed to be going so well until today. Give me a couple days and I will either figure out what went wrong, or start back on this older branch. Thanks for your patience!