It appears the debug version was last updated in July 2012, while the latest production version is from November 2012. So, we might have a regression on our hands.
I've kept the debug versions that worked for you for safekeeping:https://rodan.lastpass.com/dev/fingerpr ... sdebug.exehttps://rodan.lastpass.com/dev/fingerpr ... 4debug.exe
and updated the the debug version linked from:https://lastpass.com/debug.php#ie
So, please reinstall, and try again. If it doesn't work, send me your logs.