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: I have a 2-language site. All works o.k., but today i have tried to save second language post. And it is saving too long and result to 504 error page.
Solution: I just applied the troubleshooting steps highlighted in the attached image that appear in WPML -> Support -> Troubleshooting link.