I had the same problem: New Nexus7, eclipse, Android-SDK, Win7. Does not 
work correctly with the newest Google-Drivers and the 
Original-Asus-Drivers. Then I found something about "Nexus7-Toolkit" and 
with this Tool opened all works fine! Don't ask me, why. I suppose, that it 
has something to do with the newest Google-SDK/ADK-Update. I think, before 
that all works fine, of course only in PTP-Mode !

On Thursday, August 23, 2012 3:12:11 PM UTC+2, Compguru910 wrote:
>
> In MTP my Nexus 7 displays just fine. What I think you are having a 
> problem with is the actual driver for the Nexus 7. What I had to do was 
> install the Google USB driver for it, instead of the Asus one because it 
> has adb problems. If you want I can send you the driver and screenshot of 
> mine working in MTP mode.
>
> On Thursday, August 16, 2012 10:15:21 AM UTC-6, mkh wrote:
>
>> I'm happy to answer my own question.
>>
>> 1) Can't blame Windows!
>>
>> 2) When the Nexus 7 is plugged in there is a persistent notification that 
>> indicates "CONNECT AS / Media Device (MTP)". In this state adb devices will 
>> not show the Nexus. Not exactly obvious why, but I you select the second 
>> option "Camera (PTP)" the device is available for debugging. This choice is 
>> persistent, and I'm guessing that with a band new device it will connect as 
>> MTP until told otherwise.
>>
>>
>> On Friday, August 10, 2012 8:39:08 AM UTC-7, mkh wrote:
>>>
>>> Trying to force feed myself Windows to build character, and the seemly 
>>> trivial thing of plugging in a Nexus 7 to a Dell xps 15z Tand debugging a 
>>> "hello world" app on it from Eclipse Juno with the latest ADT plugin has me 
>>> stumped.
>>>
>>> Developer options were turned on, and USB debugging enabled.
>>>
>>> The device just does not show up, not in Eclipse, or in "adb devices".
>>>
>>> The first time I had not installed the USB driver from the sdk. In this 
>>> case the Nexus 7 shows up in the WIndows devices under "Portable Devices" 
>>> and a filesystem can be browsed from Windows.
>>>
>>> Next I installed the google USB driver. Now the Nexus 7 shows up in the 
>>> Windows devices as "Android Phone"/"Android composite ADB interface", and 
>>> at that point I thought I was moments away from looking at "Hello World" 
>>> and moving on to something interesting, but wait, there's more, adb 
>>> remained blind to the Nexus7.
>>>
>>> Any ideas, or suggestions for debugging this problem would be 
>>> appreciated...
>>>
>>>

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