No Mouse Hover Functions in El Capitan

Hi,

Having upgraded to El Capitan (Version 10.11 (15A284)) a few days ago, I've since noticed that none of the mouse over or hover functions work. This applies to things like the Safari, where hovering over a link will not highlight it, or a YouTube video where the scrub bars do not appear when moving the cursor over the video element. It also applies to other bowsers like Firefox.

It also seems to apply to the OS interface itself. Instead of simply clicking on the top menu (File, Edit, etc...) and moving the cursor over each item to highlight it, I need to hold down the mouse button and release in order to select something.

Now, what I'm not sure of is if this is by design, or if it's a genuine bug.

• If it's the former, is there an option to revert the mouse behaviours back to the more traditional 'click, hover, click' like there was is previous OS X releases?
• If it's the latter, then how would I go about reporting the bug?

I realise this is a fairly minor issue, but it's kinda frustrating.

Any advice would be appreciated.

Cheers,

Niall