So here's my problem, I make youtube videos and I use the same intro and outro clips for all my videos. I made both clips in Vegas Movie Studio, the same version I still use. Problem is, sometimes when I import the clips, the audio is sped up to maximum and looped for the duration of the clip. Deleting the clip and re-importing it usually fixes it, but sometimes when I render the video out, it happens again even though it previewed just fine. When this happens, re-rendering the video usually fixes it but this is really annoying and time-consuming.

Any ideas what might be wrong?