Sonar X3 Help - Scarlett2i2 Suddenly Not Working (Win 8.1)

I've been using X3 for a few years with no problems. Today when I went to load a project, I noticed there was no sound outputting through my Scarlett 2i2 (the same device I've used for years) and there was a lag between hitting play and the project starting to play. There was no "EQ bounce" to show sound was being output either. "W" to go to the start of the recording was very laggy as well. 

When I unplugged the Scarlett, obviously I had no output but the interface returned to normal speed for playing / rewinding. Plugging in the 2i2 got the same error - no audio or MIDI output (which has worked fine for years). 

I didn't make any changes to my system, Sonar, or anything else - I did reload the driver for the 2i2, which works fine with my Windows system outside of Sonar. Any help would be greatly appreciated! I'm running Sonar X3 on  Win 8.1 system and using a Gen 1 2i2 which has worked perfectly for a long time. I tried some of the obvious driver settings, but nothing seemed to work. 

Thanks for the solidarity. BTW, I was on the Digifreq forums for years, since 2001 or so - so I'm familiar with a lot of the quirks of Sonar. Were you able to use the ASIO4ALL drivers to find the 2i4 inputs? 

After a good hour with Focusrite help, I think it is the device itself. I tried 4 different drivers, disabling other drivers, updating stuff, etc. Asio4all works fine for playback, but I don't have input now. I ordered the Steinberg UR22 to see if it really is the software (I doubt it) or something with the Focusrite. I'll post here what happens. 

Some things to try:
 
Download and run "USB Oblivion", a utility that erases all traces of USB-connected drives and CD-ROMs from the registry.  Make sure to unplug any external USB drives first. (That includes the 2i2).
 
http://www.techspot.com/downloads/5629-usb-oblivion.html
 
Alternatively, you can go deeper and clean out all old, corrupt or obsolete registry entries from your system: 
With the 2i2 unplugged, uninstall the drivers, then run CCLeaner (Or any other registry cleaning utility.  I like JVPowerTools).  Reboot your system then install the 2i2 drivers per Focusrite's instructions.

I intalled Asio4all to this laptop I use at work to edit midi files. My Scarlett is at home in the studio. I brought it in and installed the drivers to see first hand what would happen. There's a lot of myths and bad information about using Asio4all on the forums. Most is possibly from old information. Asio4all is an ongoing development and improvements are made just like all software.
 
Anyhow, first they say asio4all interferes with your real ASIO driver. This was not true with the Focusrite driver and I had no problem switching between the Focusite driver and asio4all. But under Asio4all I lost my 3/4 input, my 3/4 output, SPDIF in/out and the MIDI ports. So for my interface a 6x6 + midi asio4all did not work. I will admit
 that I did not go into asio4all set up where I might have been able to make this work. I realized this later after I took the 6i6 back home. But that said I have no problem using the proper Focusrite drivers and I really believe you should have no problem either.  
 
I'm using the latest download of asio4all on a W7 64 bit laptop.  But to make this clear,,, this is on a laptop I do not have a proper interface engaged. For my DAW in the studio I absolutely would not use ASIO4all and use the proper drivers supplied by Focusrite ( and Tascam) Asio4all is only good for use with on board audio sound cards and certain brands of USB interfaces where the company failed to supply a good driver. Focusrite is not one of these companies and has good drivers, use them. If they are not working I would contact Focusrite support.  

Well it would be easy to test the 2i2. Just find another computer and try it out. 
But at only $140 new you'll be hard pressed to get $75 for it.