Background of the issue:
I am trying to open the Advanced Translation Editor (ATE) to translate existing Spanish posts into English. When I click 'Translate' in WPML → Translation Management → Jobs, the ATE iframe opens but never finishes loading.
Symptoms:
The screen stays on “Almost there! Preparing your editor…” indefinitely — it never progresses past this point (the editor is completely stuck).
Questions:
Why does the Advanced Translation Editor hang on 'Almost there! Preparing your editor…'?
What causes the error 'Unable to retrieve job details' in the ATE log?