We apologize for the lack of warning regarding the SteamID format change in today's update. It was our intent to give the community a heads-up before the change was released, but it was missed.
The change was made to update TF2 to use the current SteamID format, which most other games on Steam and Steam itself uses. You will find that you can now use SteamIDs rendered by these other locations in your interactions with the engine. The engine will still recognize the old format, though, so your current server ban lists should still be valid.
The conversion equation has already been posted by a community member, but here it is again:
Ich hab mich gestern auch gewundert weshalb plötzlich alle Adminrechte weg waren und die bereits gebannten Spieler in der Sourcbans Liste wieder auf die Server konnten. Mann muss zum Glück aber nur auf die aktuelle SM Version 1.6.2-git4558 wechseln,dort wurde das bereits gefixt, mehr ist nicht nötig.
We will eventually update DoD:S , CS:S, and HL2:DM with the engine changes. Those updates should happen in the next couple weeks. Those are the only planned updates at this time.