Forum display error with youtube

Anyone else experiencing this?

If I have another tab open with youtube going, this forum does not display correctly. It appears to be only this site as far as I've seen so far.
 
I used to have that problem ages ago and wasn't sure if it was because of the Dark Skin that I am using. But not noticed it recently. Only problem I have is with the Mark Forums Read shaking the entire page vertically as it refreshes.
 
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