Xbox Live launched three major apps today, but some subscribers are only able to access a few of the new offerings. While MLB.tv, HBO Go and Comcast Xfinity are now available, some folks are having issues getting to HBO Go.

Angry posts on Major Nelson's blog complain that Comcast, Time Warner and Bright House cable companies are blocking access to HBO Go. One poster said that their chat with a Time Warner representative revealed the app should be available "in the next few months." Microsoft's official site confirmed that the three cable companies were not on the list of HBO Go providers.

Users who have Xfinity will be able to access HBO content through the Xfinity app, but the HBO Go app apparently offers a wider selection of shows, according to a few posters.

An HBO representative urged subscribers to push the three cable providers to carry the app. "It is HBO's ongoing goal to provide our acclaimed programming to subscribers whenever and wherever they want it," the rep told Game Informer. "We believe the launch of HBO GO on Xbox 360 is a huge step in accomplishing that and we are hopeful that all of our distributors will chose to support the service on the Xbox platform. We encourage our subscribers at non-participating television providers to reach out to their provider and request that they add support for HBO GO on Xbox 360."

For these apps to work, you must already be an Xbox Gold subscriber, as well as a subscriber to Comcast, HBO and MLB.tv. In addition, to access Xfinity, you must have Comcast cable and internet.