I'm using Premiere Pro CS6 and when I import a m2t video into it it sometimes says "Media Offline" even though I have not touched the source files at all. Usually all I have to do in this situation is relink the files, however here that is not the case. I shot all the video with the same camera so I know it's not premiere not having the correct codecs since some of the work. The only difference I'm seeing between the different files is that it seems to be having more issues with the longer videos (more than about 1 hour and about 15gb in size). I can provide any additional information you may require.
Thanks for your help,