There is a problem with last upgrade in Czech. It's a typo but messes up the WP site with ton of PHP errors.
Happened as a result of this upgrade in last version:
-Added Czech (cs_CZ) overused words list by berniecz
Good news: Easy fix - just rename /lang/words-cs-CZ.php to /lang/words-cs_CZ.php (DASH for UNDERSCORE)
Would be good to push an update on this as it took me a bit of time to see what the heck was happening on my site and might to others who run this in Czech enviroment.
Thanks in advance.