After the 1.01 update, it seems impossible for Windows 7 users to launch any offline missions. Neither the community offline mode works nor the official offline mission.
The user launches the mission by using the -mission= start parameter. After a moment of loading DayZ just closes and or is not responding.
There seems to be no information regarding that in any log. However, this should be reproducible on any Windows 7 pc.
Prior to the 1.01 update, there never was an issue with this.