When using the Argo Navis to initially align my dobsonian mounted telescope, after MODE FIX ALT REF is completed and I enter MODE ALIGN STAR, the display shows ALIGN ACHERNAR. Spinning the dial does not change the alignment star. The display stays the same. Exiting out to other menus, the dial seems to scroll through the menus just fine, just seems to happen during MODE ALIGN STAR. This is keeping me from getting aligned. Any ideas what may be happening? It has always worked in the past.