I have had a similar problem, getting the DevMode working....
I found in the directory containing the OperationsDashboard.exe, a file called Coherent_UI.log. It listed a number of errors, including an error 'Unable to create client texture from shared handle'. Googling this, found:
After changing my Nvidia Graphics settings, I was able to get the Debug console appearing.
Hope this helps.
My environment, is a Dell Laptop, running Windows 8.1, with an Intel and NVidia Graphics card
I also have a Dell machine with Intel and nvidia graphics capabilities. Only difference is I am running Windows 7. Digging into the logs you referenced, it looks like my problem is also a graphics related issue. I made sure that both Coherent UI and Operations Dashboard are using my nvidia card but get the below error in the logs:
6020 08:37:39.206671 E | Accessing inactive internal renderer
6020 08:37:39.206671 E | GPU Process has different deviceId
Switching both to use my Intel card results in only the 'Accessing inactive internal renderer' error.
So basically I am still not able to get it working.