The 1.6.x upgrade was originally for ZC 1.3.9 which broke some of the ZLB 1.5 functionality in Google Chrome.
The upgrade itself isn't difficult, but its recommended that you uninstall all of the ZLB 1.5 files before upgrading to ZLB 1.6.
I should be uploading 1.6.2 in a few days, so you'd probably want to wait until then.
Daniel
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