Does your PlayBook app use local storage, camera roll, media sound or other device APIs? If so, you must add action requests in your blackberry-tablet.xml file when publishing your BAR file for these features to work on the device.
The camera roll in my painting application worked with the virtual machine (0.9.4 SDK) but didn’t work on the actual device.
I added acess_shared to my blackberry-tablet.xml file and the camera roll worked great. The device prompts on first run notifying the user of which permissions you requested, similar to how Android works.
BlackBerry has a list of actions documented here:
Stay tuned for a full video review of the PlayBook coming this week.
Blog post created on my PlayBook