When running an Android Application, I found that it was only using half the screen as in the screenshot here.
I had this problem when the android:minSdkVersion was set to 3 in the AndroidManifest.xml
For example the following caused the issue:
<uses-sdk android:minSdkVersion="3" />
When I set it to something higher than 3, it used the whole screen. For example:
<uses-sdk android:minSdkVersion="8" />