There is a potential issue with TV listings information in versions 1.5 and 1.5.1 of the XFINITY TV app. A new version of the app is available that addresses the issue. The new version is 1.5.2.
In some cases, the XFINITY TV app will not refresh TV listings information from the XFINITY servers. This means that the TV listings grid may be blank or cause the app to crash.
Download and install the XFINITY TV app 1.5.2 update from iTunes.