I've had a couple of problems with SpaceEngine that I've experienced multiple times. I found out that if I was to right click on the application in my taskbar and close the engine, I could not open it again. I would open it through the task bar or shortcut but it would just load, it would show that it's open but I can't see or interact anything, not even the window would be visible. I would uninstall and reinstall it but the exact same problem would happen. The only fix I found was to delete everything form SpaceEngine and re-download it from the sight. Which takes an hour because it's downloading a Gig of data.
Then, there's another issue with exporting the sky box. There's a glitch the pops up sometimes when I use this tool where after I export, it would still keep the skybox screen open. So, even when I'm in the planetarium mode, I could not switch off the sky box setting, so I can move around but I couldn't change my viewer back to normal. Opening and closing the application doesn't solve the issue, and reinstalling it seems to be the only fix.
Obviously the first glitch is the most annoying, I'm not sure if I'm the only one who's experiencing this issue, but the fact that I can't just reinstall the game shows that it's an issue that should be fixed in order to avoid future frustrations with people like myself who might be dealing with the same problem.