I am running Ubuntu 12.04 and ever since I upgraded I have been having problems with my account not locking when the screen turns off. My settings say that it should be locking, but it never happens.

This morning when I woke up I realized why: Since this has been happening since I tried upgrading my Ubuntu install to 11.10 (a failed upgrade...I just split out my home folder and re-installed ubuntu) and even carried over into 12.04, it must mean that there was a setting in my home directory that the 11.10 upgrader set which has not yet been reset since I am using the same home directory as I was then and it has the same problem. Does anyone know where this setting may be stored and where I can find it and reset it?