9 months ago - PDX_ladydzra - Direct link
It looks like you've tried most of our standard troubleshooting tips, but we've got one more for you:

Manually delete /Stellaris/ and redownload:
-- (in Steam) Right Click Stellaris, Local Files, and click Browse. Delete the contents of the /Stellaris/ folder that opens (do *not* delete the /Stellaris/ folder in /Documents/, as it contains your save files and custom empires).

If your game doesn't work after you've done this and then reloaded, go to support.paradoxplaza.com and open a ticket. Customer Support will be happy to work with you!