Firefox does not load certain Youtube videos?

I am running the 08/05/2012 build of Nightly and I am unable to load Youtube videos with ads, e.g. VeVo videos. I have tried disabling all add-ons and that did not resolve the issue.
Videos work fine on Chrome and IE. How should I approach this?

i've just seen that a problem with flash & the current nightly version was mentioned in another support question too. so probably you cannot fix it on your end & will have to waint until an update fixes it again. nightly versions are not intended for daily use and may be unstable.
if you want to use a mozilla based 64bit browser, also have a look at [http://waterfoxproject.org/]

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Firefox does not load certain Youtube videos?

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