Could you make sure you are following the below steps to add the layers?
1. Add your UTM zone coordinate system layers like vector or raster layer into GisEditor.
2. Setting the projection as the map projection. I think you should look for your UTM zone coordinate system projection.
3. Add your Mrsid raster images to GisEditor, then the GisEditor will convert projection from the added layer to map projection automatically.
If you did do those, would you please let us know more details about your UTM zone coordinate system and MrSid projection? does those projection are used Nad Grid?
I think it is better if you can take a video or send us your data?