There's a known bug on webOS 2.x devices which can cause 3rd-party apps to lose access to the device's media files (this includes photos, music, and videos).

In Wall Switch, the very first time you install and use the app, you must explicitly grant permission to your local files before the app can continue. Similarly in Slide RSS, you must explicitly grant permission the very first time you attempt to add Local Albums.

If you're affected by this bug, please try out the fix in this thread. If you are still unable to resolve the problem, please email us via the link within our app.