I seriously need some help with this, it's so frustrating.

So basically my Sony Vegas has always worked completely fine, ran smoothly rendered pretty quickly and has just been efficient to use. But for some reason recently it keeps not responding every time I put a certain type on file into it (M2TS) but here's the thing, I'm not sure if the problem is to do with my Capture Module for my HD PVR or Sony Vegas. Watch this video please:
As you can see the file 'Drake Fail' works completely fine and dandy but then when I put the newer one in recorded recently, Vegas just decides to stop working. I'm completely confused with this I honestly do not know how to deal with it. Someone must have had this problem before but I can't seem to find any answers.

If you'd help me I'd fucking love you FOREVER.