Expand audio does not work in FCP X?

when I use expand audio from video (cntr-S) accoding to the helpto split video/audio it does not work; the audiowaveform disappears, there is no split in audio and video. Only the audio is functoning and then the colour is green.
A bug?

I just restarted the macbpro and the program, tried again and now it works.
thanks for your attention.
bruce

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Hello faith67baillie,
Welcome to the HP Forums!
I understand there is no sound from CDs or your Music folder. I will do my best to help! First, I require the following information, and clarification of the issue:
1. The computer's model number. If you require assistance locating this information, please reference this website: Guide to finding your product number
2. The computer's operating system. If you require assistance locating this information, please reference this website to determine your Windows operating system.
Additionally, if the issue just began occurring, I would perform a system restore. I want you to bring the computer back to the earliest restore point possible, in an attempt to dodge whatever caused the issue. Here is a document on how to perform a System Restore: System Restore
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I worked on behalf of HP.

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Expand audio does not work in FCP X?

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