Trimming audio clips: my pointer doesn't change

When i drag my pointer to the edge of the audio that i want to shorten, it doesn't change to the trimming icon. I've tried it with the "show volume levels" option both on and off, and the pointer still doesn't change. It used to work about 2 weeks ago, but now the pointer won't change so i can't adjust the length of my audio clips. Any ideas?

Usually those 3 things: Trash the plist, repair permissions, running DISKWARRIOR, will take care of the small glitches. Try dumping imovie and reinstall. A work around would be to cut your audio at the point you want to start and end.
If it's a prerecorded file you could insert into a editor such as SOUND STUDIO and adjust from there.
I have found that cutting the audio will leave some of the ends unable to adjust. I don't know if this is normal but I'm able to work around it.

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