When I tried to extract that file to my Bin folder, it asked if I wanted to replace the one that was there (I cancelled the extract).  So I don't think that is my problem.

I have found, after various attempts to use earlier versions of the dll that the problem lies in the latest version of the skin itself.  Replacing the .aspx and html versions of the vertical menu skins seems to have sorted the problem out - for me at least.

Hope this helps.

I am having this same problem.  I tried to create my own skin, and now I can't get the vertical menu to work, even on the original skins.  How exactly do you change the level ?

Thanks,

Mark Richards

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