Rooting via Nexus Root Toolkit v1.6.2 for 4.2.2
It seems like the OP may not have too much experience like me based on his post count. The responders on the other hand seem like guru's.
Well I did some troubleshooting after 4.2.2 to try to get the rooting to work (yes, i used google search). Just for the record I'm new to all this, but I've been doing a lot of goog'ling and figured the time I spent troubleshooting may be of help to other novices.
Apparently the rooting issue is well known if you're using the Nexus Root Toolkit v1.6.2 to try and do your rooting. There's a fix available which is described on the main webpage (between the red lines)
google wugfresh for homepage (I can't post links yet)
Just download the zip file and unzip in the folder described, overwriting what's already there there. Make sure your drivers are working . They were acting really finicky for me when using the toolkit but I finally troubleshooted it. If you're having issues you may want to try the newest PdaNet driver, although I didn't have to. Once your drivers are fine, select the Android "any" option and hit root with Custom Recovery checked. I dunno about everyone else but my Custom Recovery was gone/messed-up after upgrading to 4.2.2
If you don't use Nexus Root Toolkit, I recommend it for the less computer savvy ppl out there, like me. Hopefully they'll come out with an update.
Hope this helps.
One newB question I have is can I install my 4.2.1 custom ROMs after upgrading to 4.2.2? I'm not sure if there's some kind of firmware component of 4.2.2 that'll render my Nexus 7 incompatible with the 4.2.1 custom ROMs out there. If it's not okay is it possible to downgrade back down to 4.2.1 from a factory image and then install these custom ROM's?
Thanks ahead of time.