Objects can no longer be edited after creation?? WTF did I do??

I’m having a very strange issue here (probably something simple and obvious to make me feel like an idiot). I can no longer edit the values of my objects once I create them. All the editable values in the f6 menu are now ghosted. This is happening for me on both the latest build and the 2.71 release, which makes me think it may be something in my preferences. I would rather not blow away my prefs and start over so I was wondering if anyone else has experienced this and how did they deal with it?

I know this problem, just load Factory Settings and Save startup file. You will lose all your own settings but it works.

Awesome!! That was it! Thanks!

EDIT: To clarify, I enabled global undo.