There have been reported login problems in the Wordpress Admin dashboard after upgrading to 3.3. Apparently there is a compatibility issue with certain plugins - the "Popus Domination" plugin for one and a couple of others as well. If you see the error "Call to undefined function is_rtl()" in the logs then please read the links below for the solution.
http://orangecopper.com/blog/fatal-error-on-wordpress-version-3-3-call-to-undefined-function-is_rtl
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Cumartesi, Aralık 17, 2011