Audio won't play when I'm skimming through clips on iMovie

The audio of the clips I have on iMovie won't play when I'm skimming through them, but will play when I play the clips. I made sure the volume of every clip and on the computer works (it does) but this is getting really annoying. Can anyone please help me out?

To Reboot your computer, select /Shutdown... from the top menu. Wait a few seconds, then turn your computer back on with the on switch.
You don't really have to know what a swapfile is, but here is a simplified explanation.
Your computer comes with a processor (Intel 2.8 ghz in my case), memory (2GB in my case), and a hard drive (500GB in my case).
The processor is very fast. The memory holds the instructions and the data that the processor will work on next. Long term storage is kept on the hard drive, which is slower. Think of the following metaphor: You are sitting at a desk. You are the processor. Your desktop is the memory, which contains the stuff you are ready to act on. Stuff you have already acted on, or will not need until later, is in the drawers or in a file cabinet (the hard drive).
Let's say you are working in several applications at once: iMovie, Microsoft Word, iTunes, Calendar, and Safari. Each of these programs needs some of your memory to function, and to get stuff to the processor for action. If you add all the memory requirements up, it may be more than the 2GB of "real" memory that you have. Fortunately, OSX lets you use virtual memory, so your programs can pretend they have as much memory as they need. Your programs can address memory as if they had a whole bunch of memory all to themselves.
This is done through swapfiles. When there is more virtual memory than real memory, the programs and data that have been used least recently are swapped out to hard disk in a swapfile. This file is not the permanent storage. It is the temporary parking place for memory when the real memory is being used by another application.
So lets say you want to use iMovie. It might take up 1GB out of your 2GB. There is not room, so OSX looks around and sees that you haven't used iTunes in a while. So the itunes instructions and music about to be played is swapped our to a swapfile on the harddisk.
If you decide you want to listen to iTUnes, you will have to wait a few seconds as iTunes is swapped back in to real memory, and something else is swapped out.
This is a simple case. It can get more complicated.
But, as you run more and more programs, the real memory gets used up and there might be seven or eight swapfiles out on disk. At some point, OSX gets sluggish and has a hard time dealing with this. For example, if two large swapfiles needed to be paged in at the same time, there might not be room. Also, the real memory can get fragmented, and have open space, but the open space is not big enough to swap something in.
I run a free utility called Memory Stick that shows me how many swapfiles I currently have. If I am working on something critical in iMovie, and I notice that I have a lot of swapfiles, I will usually just reboot and start over with 1 swapfile. In doing this, I hope to avoid the spinning beach ball that happens when OSX can't handle it any more.
You don't really need to know this. OSX handles it for you. But understanding how it works can help you self-diagnose some problems from time to time.

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    From: [email protected]
    To: [email protected]
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