1 person found this helpful
Noone knows why, but the soundtrack and narration tracks regularly DO cause problems. First make copies of your original audio tracks (just in case) Then, as you cannot remove them from the timeline, try deleting them from the Project Media pane. This should warn you that it will remove the items from the timeline. Select yes. Go back to your project and add the audio clips to one of the higher audio tracks (e.g. Audio_2 and Audio_3.
Insanity is hereditary, you get it from your children
I agree with Neale on this one. The Narration and Soundtrack are "fixed" Audio Tracks, and have at least one property, that other Audio Tracks do not have - they cannot be Deleted. Usually, they work just fine, as their names indicate, but then sometimes, they just refuse to work properly. Why? I have never seen a common element, when they just sort of freeze up, or refuse to mix-down their Clips.
Because this behavior has struck several, most of us just recommend NOT using either, and instead, just using an empty regular Audio Track. I cannot recall an instance, when that proceeure did not work. This behavior has been around since about PrE4.0, by my readings, but may have happened to even earlier versions. There is just something in the structure of those two Audio Tracks, that gets "out of alignment," either with certain operations, or perhaps certain Assets.
On the note of "certain Assets," do you happen to have any MP3's on either of those Tracks? They can cause no end to problems, and not just on those two fixed Audio Tracks. If you do have MP3's, take a look at this ARTICLE.