Please make sure to update to WPML 4.3.6 and check our list of Known Issues before reporting
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This thread is resolved. Here is a description of the problem and solution.
Problem:Invalid site key for the current site.
Solution:Please go to https://wpml.org/account/sites/ there you should be able to see your site registered (unless u never register your site before)
then click on the little trash icon
and follow the steps shown in the video http://screencast.com/t/nhRozB9TBtBi