An Annoying Audio Problem within Encore Project

Hi to all Encore 2.00 users

I produce Wedding Dvd's

From each Wedding I build a 4 min highlight sequence with added music.

Each time I finish a sequence I add it to an Encore project which I call
"Wedding Dvd Demo"

At present this demo DVD contains 10 sequences each on their own timeline.

I have found, on occasions usually after adding a sequence and for reasons which
I cannot at present pinpoint the audio to each sequence will not play.

To rectify this I have had to delete the audio from the timeline and then drag
the audio from the project onto its appropriate timeline, then all is well
again, until perhaps the next time.

If anyone could give me a clue as to why this is happening it would help me
enormousley.

Best Regards