xDx designer opens read only in xtream mode

When you say xtream mode you mean you are opening the design in concurrent mode? If this is the case then you need to ensure the RSCM software is configured properly to allow multi-user access. The key here is to have the RSCM service started by a 'Service' account and not admin (Windows) or root (Linux). The service account is generally set up as a user who has access to all projects (read/write) but is generally not used as a regular login, thereby allowing other users read/write access as well. If you are the only user of the system then you don't need to set up RSCM - but if you do make sure your account starts the service. This is explained in the Admin guide and is configurable from the RSCM tools.

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