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I've been on the Developer Preview since day one, but only yesterday Bing News started crashing on launch. It shows the featured story, but then crashes. It has been working perfectly before yesterday.
I've noticed the same with the Facebook beta app, though the non-beta is fine.

Hi Chanh,
Tried everything you said but nothing worked. However, while doing some app debugging, I did clear all of the checkboxes in the Windows Phone Power Tools for Visual Studio 2013 for one of my apps and now the crashing apps no longer crash :S

Hello Derek,
Thank you for contacting Microsoft Support. With regards to your issues regarding crashing apps, are you noticing any error messages or codes? Also, do these crashes occur when connected to Wi-Fi or cellular data?
Try opening up Storage Sense and clearing out your Temporary Files folder. Also, hold the Back button on the phone and see if there are any other background processes/apps running. If so, close them and see if the Bing News and Facebook beta
app still have this issue.
Regards,
Chanh S.

Hi Chanh,
Tried everything you said but nothing worked. However, while doing some app debugging, I did clear all of the checkboxes in the Windows Phone Power Tools for Visual Studio 2013 for one of my apps and now the crashing apps no longer crash :S

Hello Derek R Lakin:
Thank you for the follow up. We are glad to hear this behavior has stopped and hope it continues to work without issue. I have marked your post as answer in hopes this helps others that might have the same issue. If this behavior begins
again, let us know. If any others are having this issue, let us know if these steps worked to resolve it.
Please let us know if you have any other questions or concerns.
Mark W.