Why isn't Downloadhelper working with Youtube?

I have been using the Downloadhelper add-on for years on my laptop with no problem. I noticed about three days ago it was no longer working with any Youtube videos. The rotating icon is still working, and when I click on it, it still gives me the file type choices for downloading. However, after I click my choice, the green arrow shows the downloading process, but comes up '0 bytes' for every type of video.
I am not having problems downloading videos from other sites that I've used before, just Youtube.
Also, I am able to use Downloadhelper with Youtube on my other computer without a problem.
Can you please help? Thanks.

UPDATE July 19th 2013: 
here is the fix for 4.9.17 is as follows: 
For today's youtube changes, please follow this procedure for downloading 
videos that currently generate empty files: 
- Open url "about:config" 
- Create a new parameter called "dwhelper.yt-sig-perm-85" of type String 
- Set its value to "[[2,8],[0,1],[9,21],[65,66],[22,65],[84,85],[66,82],[21,22] (without the quotes). 
- Reload the youtube page (no need to restart Firefox) and you should be done.

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Why isn't Downloadhelper working with Youtube?

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