I have an Onkyo TX-DS575x receiver. I have been using the 1st optical input for some time. I just tried to connect the 2nd optical input but I cannot get the menu system to prompt for the optical 2 input. According to the manual and Onkyo tech support I should be able to assign any source - V1, V2, V3 etc. to any of the 2 optical or coax inputs. There should also be an "auto" setting that allows the receiver to automatically select the proper input. These do not present themselves. The menu goes from Optical 1 to Coax1 then Coax2, bypassing Optical 2 and "auto". It does this on all sources. Has anyone else experienced this problem? Any suggestions?