What is a good nuker hack client for Minecraft 1.7.2?

You should use Nodus, really sweet cilent.

You can also try WeepCraft or Hudini

First of all Install Huzuni, 100% better than Nodus and no bugs at all.
Huzuni Installation Tutorial [www.tidyurl.com/HuzuniTutorial]
Huzuni Website: [www.tidyurl.com/HuzuniWebsitee]
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If you wish to continue using Nodus you can, but i don't recommend.
Try to Re-Install
If that doesn't work try to disable all mods you have on minecraft & do a re-installation of Minecraft itself, then go check both versions of Minecraft & Nodus [have to be the same].
Go to the Nodus Website and download it again and install it using this tutorial: [http://tidyurl.com/NodusTutoriall%5D
Restard your Computer

It should work now. Rate me!