I backed out of the garage using the rear view camera, returned to "Drive" and noticed that there was no time indicated on the Nav/Radio display. The radio at this moment was "off". Turned the Radio "on" and the screen was still blank but the radio was playing normally. Continued driving to my destination wondering if a fuse had blown for the display? After parking the Acadia at my destination I again selected reverse and the rear view camera again displayed the proper view. Selected Drive and all returned to normal display. The Acadia came out from a heated garage (60 F) to an outside air temperature of minus 5F. Any ideas as to the problem would be most welcome. It seems that the changeover from rear view camera to forward drive is the suspect area. ???