Sound Problem

[crispianlorford]

I have been working on a power point presentation which seem to have
been working fine, I have been working on some animation on a new
slide, when i have noticed that all my previous music clips only play
for a brief second - i'm not sure what i have clicked on but can't
found any solutions to overcome it apart from re - inserting all music
clips again.

Any pointers would be great!

Thanks

Crispian