I had two of the ThunderCats Magazine posters in generic frames (cheap-o design, cardboard back, flexible pastic "glass", and 4 strips that form the frame. When moving back in the winter (7 months ago tops) both posters and frames were fine when I hung them on the wall. But I recently bought new frames so I could have all 6 in matching frames; for some reason they no longer come in the gold color the first two were in. When I took the first poster down and transfered it to a new frame, all looked normal. But as soon as I took the second one down I noticed there were little bumps on the wall where the frame had been. The bumps are a rusty color and wipe off leaving a smear. The cardboard back had some bumps too. When I got to the poster I found a spot the size of a quarter on the back with these bumps, but also found several strips of white bumps on the back of the poster as well. The only thing I can think of is there is an AC vent that is drirectly above where this poster was, maybe the air coming out has been more moist than I thought and somehow started to mildew. Is there a way to salvage the poster? Or now that it has gotten these bumps, is it doomed to have them come back? Why, oh why, does it have to be one of the posters I only have 1 of?