Problems getting DK2 working with ED

I played ED with the DK2 for several days on my machine just fine. I then took a break. I haven't played for probably 3 weeks. I started up ED today, and now when I try to change display to "Secondary", the screen on my primary monitor starts flashing black. This alternates with the DK2's display. That is, My primary screen will flash black, then my DK2 will flash black while the primary shows "normal" display, and vice versa. So I went to update the runtime to 0.6 (from 0.5) thinking this would help, but it did not. I'm not sure what other info to provide, so here's some dxdiag stuff.

Hope someone can give me a hand. I'm confident this is some issue on my machine as I don't see any other people complaining about it. Any ideas or help would be appreciated.

Code:
   Operating System: Windows 7 Ultimate 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.150316-1654)
           Language: English (Regional Setting: English)
System Manufacturer: To Be Filled By O.E.M.
       System Model: To Be Filled By O.E.M.
               BIOS: BIOS Date: 05/14/12 20:46:33 Ver: 04.06.05
          Processor: Intel(R) Core(TM) i5-3570K CPU @ 3.40GHz (4 CPUs), ~3.4GHz
             Memory: 16384MB RAM
Available OS Memory: 16278MB RAM
          Page File: 4924MB used, 27630MB available
        Windows Dir: C:\Windows
    DirectX Version: DirectX 11
DX Setup Parameters: Not found
   User DPI Setting: Using System DPI
 System DPI Setting: 96 DPI (100 percent)
    DWM DPI Scaling: Disabled
     DxDiag Version: 6.01.7601.17514 64bit Unicode
         Card name: NVIDIA GeForce GTX 970
       Manufacturer: NVIDIA
          Chip type: GeForce GTX 970
           DAC type: Integrated RAMDAC
         Device Key: Enum\PCI\VEN_10DE&DEV_13C2&SUBSYS_31601462&REV_A1
     Display Memory: 3700 MB
   Dedicated Memory: 4009 MB
      Shared Memory: 3787 MB
       Current Mode: 2560 x 1440 (32 bit) (59Hz)
       Monitor Name: Generic PnP Monitor
      Monitor Model: DELL U2711
         Monitor Id: DELA055
        Native Mode: 2560 x 1440(p) (59.951Hz)
        Output Type: DVI
        Driver Name: nvd3dumx.dll,nvwgf2umx.dll,nvwgf2umx.dll,nvd3dum,nvwgf2um,nvwgf2um
Driver File Version: 9.18.0013.5012 (English)
     Driver Version: 9.18.13.5012
        DDI Version: 11
 
we are using SDK 0.5
0.6 doesnt work at all, so dont bother for now

go back to 0.5 and check your nvidia drivers. then confirm your NVCP has the dk2 set properly as secondary 1080p/75hz
and windows res that dk2 is secondary and extended
and confirm the oculus software is set to extended mode
 
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