about 2 years ago - MrFreake_PDX - Direct link
Are you and your friend both on Steam? If both of you are on 3.3.2, it seems likely that one of you has a mod running, or a corrupted/edited game file.

The correct checksum (the number in brackets after the version number) should be 87f3. Whoever doesn't have that, needs to disable their mods. If that doesn't work, you can try verifying game files (Right click Stellaris, Properties, Local files, Verify Local Files), and if that doesn't work, delete the entire Steamapps/Stellaris/ folder (not the one in /documents/), and reacquire it from Steam.

If all that stuff doesn't work, then open a ticket at support.paradoxplaza.com, and Customer Support can help you. :)