MTS files wonderin behavior

If I try to add an MTS file into the timeline in an older Project, which runs now on the newest PP, I will see (get) only the audio track. I cannot add it as an video, but in the media browser all looks fine.

If I open a new project in PP I can add the MTS file without any trouble. 

Just wondering what can be wrong? Settings?

cheers,

BTW chrosscheck with After Effects, all looks fine with MTS.