There really is a separate list for your created tracks. You can select generic course creator tracs to generate from the main list I think. [TANGENT] It can remember a track indefinitely if you don't generate a new one on or off line, even if you didn't generate it the first time. [/TANGENT]
There's another whole list with your saved tracks, in the same menu. I think it's active whatever you have selected in the main list. Time and weather shouldn't be any issue in your lounge.
EDIT: Were you looking in the lounge setup menu from the GT Life screen? I don't think you can set it to default to a custom track. You need to actually enter the lounge and then change to it from there.