Trying to re-root

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http://androidforums.com – I previously rooted my nexus 7. Now, probably because of the latest update, it does not appear to be rooted. I originally rooted it with the "Nexus Root Toolkit v. 1.5.5 by WugFresh". It was long enough, that I don't remember the exact steps I took nor the guide I followed. When I try to re-root it with this same root toolkit, it reboots my nexus a few times, and then it opens up TWRP, Team Win Recovery Project. I don't know what to do there, so I tell it to reboot the system. After that, the root toolkit gives me a message saying that everything looks good to it. So then I (General)