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I've had issues with Maven and the charts add-on today.
The issue is the corrupt .zip problem. I received the following In Eclipse, "Archive for required library" "cannot be read or is not a valid ZIP file".
Checking my local maven repo, the charts lib were 99k in size, which means maven download was corrupted somewhere.
Deleting my maven repo charts folder, eclipse cache, etc. did not resolve the problem
The files seem ok at http://vaadin.com/nexus/content/repositories/vaadin-addons/com/vaadin/addon/vaadin-charts/3.2.0/ and http://mvnrepository.com/artifact/com.vaadin.addon/vaadin-charts/3.2.0
I finally just downloaded and override the jars in my local maven repo.
Just an fyi that something is goofed up somewhere, and what I did to resolve the issue.