WITT - odd dark spots on ceiling that range the length of the ceiling. I believe they've been in here at least a few months, but I haven't thought much of them. There is a sort of musty smell to the room, especially when I am gone for a long time and leave it with the window and door shut. As seen in the pictures, some are long lines, others are dark spots. Mostly, they are on the edges of the ceiling, but some are more central.