BlackBerry - 9860 shows app in small window - not using whole screen - blackberry

One of our clients has come back to us today with a bug that has been found on the Torch 9860 (running OS 7.0).
It seems my app is running in a small box in the centre of the screen, with a big blue border surrounding it. If the soft keyboard is not showing, there is a black box where the keyboard would be.
This issue has not been reported before on other devices, and the app has been "in the wild" for a while. I have not seen it on our test devices - but do not have a Torch 9860 to test with.
I have attached photos of the app running on the device. The blue border is the problem - normally my app would fill the whole screen. I did not create the blue border (to the best of my knowledge).
Apologies for the photos - this is what they sent to us.
Showing the app running in a small box surrounded by the blue border. Note the black space where the keyboard would be if it was required.
Showing the app with the soft keyboard visible.
With some googling, I found 1 possible reference to this issue to do with an instant messaging app not showing correctly on 9860. Feedback was that they were looking into it.
I wonder who else has seen this, or can recommend solutions?
Updates
runs fine on the 9860 emulator
seems to be mentioned in this thread: Blackberry OS 7 Compatibility failed with 9860/9850 device

Thanks, Rafael (left answer in a comment to my question).
Based on the comment I told the client to run the app in compatibility mode (accessed through the system options - application options menu). This seems to have fixed the problem without me having to recompile for SDK 7.0 (also I don't have to start supporting multiple OS's yet).

I already had the blackscreen on bottom when the keyboard should be popped. But it happened rarely and get resolved with an update of the Blackberry
Ask for the OS version/platform of the Blackberry, and propose a update to him, if available.

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