I had a thread in the imac section about the dust and dirt buildup on the inside of the glass. It seems that this issue can develop even as soon as 4 months. Apple will replace the screen but it happens all over again. during the discussion someone had posted some links that it was actually happening with the thunderbolt displays as well. This shocked me because there is no air circulating in the TBD. Has anyone developed this issue and is there anything that can be done about it like sealing the edges with masking tape.