Why does the airplay icon not appear after upgrading to Mavericks on my iMac.

I am using an Apple TV, iPad 2, and an iMac with wifi sharing enabled.  Before upgrading to mavericks I was easily able to use airplay to mirror the display of my ipad2 to a projector.  After the upgrade the airplay icon will dispear.  When I restart the wifi sharing on my imac then the airplay icon will reappear on my ipad.
Does anyone have a fix for this.  I use this in my classroom and this problem made yesterdays lesson almost undoable because students were givng presentations and each time a student wanted to project thier ipad screen I had to reset my wifi.

http://support.apple.com/kb/ht5404
Scroll down to the bottom, read and then perform the troubleshooting steps provided.

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