This thread is resolved. Here is a description of the problem and solution.
Problem: Recently, we've been having problems with Elementor unable to find 'the_content' and displaying an error when attempting to load the Elementor interface. When entering Elementor safe mode, this error goes away (safe mode will disable external plugins)
Solution: Seems a different plugin was actually causing the problem, but disabling WPML resolved it. After further testing I isolated the issue to a regression error on the other plugin's part.
This is the technical support forum for WPML - the multilingual WordPress plugin.
Everyone can read, but only WPML clients can post here. WPML team is replying on the forum 6 days per week, 22 hours per day.