Take a good hard look at the photo above (click to enlarge). That's the difference between 16 bits per pixel and 32 bits per pixel in your apps. That is also why we agree with Long Zheng of iStartedSomething to push developers to get on board with the new opt-in feature, and thankfully it appears to be a pretty quick fix. The bpp option can be fixed by editing in the app tag of WMAppManifest.xml. For the code you should be looking for, head on over to the source link below.

Source: iStartedSomething