Let me explain why such behaviour.
In the Settings menu | Options | Paths | File with Generated Script, you set a default path for the generated script. This path will be used for all new models you will create until you change the location for particular model in the DDL Script Generation dialog | General tab | Location of SQL File.
Then the default location will be used only for new models. For particular model, the particular location will be used.
TDM 3 allows you to define different settings (different options for script generation, including the generated script location) for particular models. The settings is saved within the model. Please see the Save Settings button in the DDL Script Generation dialog. This behaviour has been required by many users.
So, this is the reason why you can see your colleague’s path in his model. If you like to change the location, you need to do it manually.
If you have any questions, please write me back. Thanks.
Have a nice day.