In my previous post I analyzed the lookup issue caused by the latest version of Google Chrome (link) but I wasn't able to provide a solution.
Google Chrome 38.0.2125.111 fixed the lookup error, please update it.
The solution works with CRM 2013, but it's not tested with CRM 2011 UR12+.
Download from Codeplex:
REMEMBER THAT THIS SOLUTION IS UNSUPPORTED.