I just saw the upgrade to 1.4.5
Now I'm running 1.4.4 – not sure if you've done something with the update to take a stab at fixing this, or if it's specific to just me :-/
I will backup my database as you recommend and upgrade. Do you think that will fix it?
I'm using a static front page but Polylang is not involved with it. It's an HTML page I coded that doesn't involve any WP PHP.
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