Hi, I know that Intel HD Graphics 520 is not an ideal video card for Space Engine, but it (generally) works very well for me.
But some times I'm having an error just after start Space Engine (usually when there is a Sun Flare visible), it's some kind of post processing shader numeric error which bugs some shader cells, but not all of them.
If I exit and enter again, eventually this error goes away and the game works perfectly for any time I want.
[youtube]Rc1ZBJFZx8I[/youtube]