It looks like this error usually occurs on Google Chrome and not on Firefox. However, the first step to try would be to use a different browser like Internet Explorer to see if you still get an error using that.
Here are instructions from Zinio on how to resolve the issue if using a different browser doesn't help:
http://imgs.zinio.com/cs/support/usa/faqs/zr4_air_problem.html
Please let us know if you continue to have trouble with Zinio.
