Problem installing any video add on

Hi All,

New here and this is my first post. I have just installed XBMC On OpenElec on my RP.

I do have one problem though, I cannot get any of the video add ons to install. I have tried the YouTube add on several times and it says Working in the bottom right for about 10 seconds but it has not installed.

I have tried a few other add ons from the list with the same problem.

Any help would be much appreciated

Ihanks

Z