This appears to be a known issue in API 18+, and there's a workaround involving wrapping your view in a LinearLayout.
See the answer in this thread.
In your case, the fixed code should look something like:
<LinearLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignBottom="@id/behindLinearLayout"
android:layout_alignLeft="@id/behindLinearLayout"
android:layout_alignRight="@id/behindLinearLayout"
android:layout_alignTop="@id/behindLinearLayout"
android:background="@drawable/overlapping_bg" >
<TextView
android:id="@+id/overlappingTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:text="Waiting for user confirmation..."
android:textColor="@color/blue" />
</LinearLayout>