Lightroom 5.7 + Canon 1Ds Mark 3

I'm having some issues here with LR 5.6 and now 5.7.

Windows 7 x64
LR 5.7

1Ds Mark 3 firmware 1.2.3(latest)

When I'm in an image LR is something failing to refresh and it just shows a black image within the develop module.
No preview in the Detail tab little window.

and the ALT key is not showing the feedback(visualization​) that it's supposed to when you hold it down.

Is 5.7 broken? Or is there an option that I'm missing somewhere to enable the feedback(visualization​).

It's even happening on older 1Ds Mark 2 images that I've already edited with success in the past.

Thanks guys.

Well after 5 reboots and a reinstall and a driver for my video cards, 5.7 is now working as expected lol