Hi,
We recommend reading through the Getting Started tutorial here: http://www.edgelib.com/index.php?node=38
It explains how to create a resource.rc file which you need to disable GAPI emulation on your device. After creating the file, read the 'Native high-resolution applications' chapter on that page.
However, it's odd that it happens when building with the Windows Mobile 5 SDK. Are you sure it targets the Windows Mobile 5 SDK and uses the Windows Mobile 5 EDGELIB library?