After discovering a minor potential securty problem we decided to patch the game to correct it.
This should not change anything noticeable for you in your game. But there is the small possibility that mods you are using may be utilizing the security flaw in a non-malicious way and may therefore stop working with this patch.
If that's the case, you can revert your game version by right clicking the game in Steam -> properties -> BETAS and select the "3.04-no_security_fix..." version. Please note that you do that on your own risk! That version does contain a known security flaw!