Well, i know what probably happened. You had lpsmagic installed when upgrading to PR1.2 and probably done somw funky stuff when upgrading to 1.4.1.

So now your backup is from pr 1.1

Replace /usr/share/themes/base/meegotouch/libsysuid-screenlock-nokia/style/libsysuid-screenlock-nokia.css with contents of http://pastebin.com/PKGZrTDB after uninstalling lpsmagic.

Restart and enjoy. hopefully 2.0 will solve this issue forever.