The developer releasing a hotfix to address a couple of critical issues that popped up in version 1.2. Specifically, there were situations where you could encounter a blank invasion screen when trying to invade an enemy planet. Also there were still some lingering issues where AI escort vessels could become confused about their purpose in life after the capital ship they were guarding blew up.

These issues are now resolved and a hotfix is up. If you are experiencing these issues then just verify your steam files or restart steam to grab the patch.

They have also fixed an issue where the game could hang after defeating the final planet of an enemy. If you have a hang then this will fix that.