In T1550#60552, @lancake wrote:

-feedback-
It's possible that it can take a while to get passed 50%, it has to load a big file then.
You may have experienced some game related issue too, please provide your log file when you're stuck at 50%.
They're located in your starmade/logs folder, the one you want to share should be called log.txt.0 (sort on date, take the latest one) after you've exited your game.
Drag and drop that file into the comment section to upload it.