Please make sure to update to WPML to the latest and check our list of Known Issues before reporting
This is the technical support forum for WPML - the multilingual WordPress plugin.
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This thread is resolved. Here is a description of the problem and solution.
Problem: The language cookie is preventing the site from caching when using varnish caching.
Solution: The issue was fixed in WPML 3.6.3. Please make sure that you have the latest WPML version installed.