I doubt you will ever have it working 100%. I have tried several (probably well over a hundred) suggestions and versions for my no name 7" CE5 GPS. Nothing has ever come close to fixing that error. I can view the maps and that is about all and still enjoy using Garmin maps. If you ever find a cure please let us all know!
For navigation I moved on to other software that works perfectly - iGo, Primo, TomTom, OziCE etc.