Mine did that when I sideloaded it but the Nexus Root Kit said it can take up to 10 minutes or longer and to have patience.Mine seemed to take a good 15 minutes to install. I was getting worried that it was stuck on the swirly orb screen but then it was fine. Seems snappier but maybe it's my imagination.
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I got the OTA notification and attempted to install to my Nexus 7, but it failed with an unknown error. Tried about a half dozen times and finally gave up.
Side loaded the 5.0.1 razor version and my Nexus 7 is working perfectly.
Keep in mind the OTA upgrade to lollipop can take a long time because it must compile all of your installed apps for the new ART runtime. Side loading is fast as it erases the entire device first.
