I had the same problem after this update.
Fix that helped me was to opt out of any steam beta client.
This was posted on cliffs steam discussion forums.
After i opted out cliffs booted first time.
Thats steam client beta under steam settings and not cliffs beta.
Hope it helps.

Looky.

Hi guys.
Nvidia released another driver today.
350.12 whql.
I can confirm these drivers work perfectly in cliffs online on win 8.1

get them here.
http://www.guru3d.com/files-details/gef ... nload.html

Regards.
Looky.

Squadron: No. 64 Squadron
Squadron Code: SH
Pilot Name: Looky
Type: Spitfire Ia 100 octane
Marking: A for "Apple"
Date: 16 Aug 1940
Base: Kenley



Claims:
Confirmed: 0
Probable: 0
Damaged: 0

Losses:
AC: ok
Pilot: ok

Squadron: No. 64 Squadron
Squadron Code: SH
Pilot Name: Looky
Type: Spitfire Ia 100 octane
Marking: A for "Apple"
Date: 16 Aug 1940
Base: Kenley

Claims:
Confirmed: 0
Probable: 0
Damaged: 3 x bf109

Losses:
AC: ok
Pilot: ok

Squadron: No. 64 Squadron
Squadron Code: SH
Pilot Name: Looky
Type: Spitfire Ia 100 octane
Marking: A for "Apple"
Date: 15 Aug 1940
Base: Kenley



Claims:
Confirmed: 2x BF109
Probable: 0
Damaged: 1 x BF109

Losses:
AC: ok
Pilot: ok

Squadron: No. 64 Squadron
Squadron Code: SH
Pilot Name: Looky
Type: Spitfire Ia 100 octane
Marking: A for "Apple"
Date: 15th Aug 1940
Base: Kenley





Claims:
Destroyed: 0
Probable: 0
Damaged: 2 x bf109

Losses:
AC: light damage
Pilot: ok

Squadron: No. 64 Squadron
Squadron Code: SH
Pilot Name: Looky
Type: Spitfire Ia 100 octane
Marking: A "for apple"
Date: 14 Aug 1940
Base: Kenley



Claims:
Confirmed: 2 x bf110
Probable: 0
Damaged: 1 x bf109

Losses:
AC: ok
Pilot: ok

Squadron: No. 64 Squadron
Squadron Code: SH
Pilot Name: Looky
Type: Spitfire Ia 100 octane
Marking: A for Apple
Date: 12 Aug 1940, 19:00
Base: Kenley


Claims:
Confirmed: 0
Probable: 0
Damaged: 2

Losses:
AC: OK
Pilot: OK

Squadron: No.64 Squadron
Squadron code: "SH"
Pilot name: Looky
Date: 12th August 1940
Base: Manston
Type: Spitfire Ia (100oct)
Marking: A for "Apple"

Claims:
Damaged:1
Destroyed: 1

Pilot: OK
A/C: OK

Squadron: No.64
Squadron code: SH
Pilot name: Looky
Date: 12th of August, 1940
Base: Kenley
Type: Spitfire 1A
Marking: "A for Apple"
Serial number: N3032

Synopsis:


Claims:
Confirmed: 0
Probable: 2
Damaged: 0

Losses:
AC: ok
Pilot: ok