"Enable Automation Events" should be set by default. Is this a brand new install? By whom?
I think something has messed up your Glue settings as well, look at the Snap and Glue settings, maybe Glue has been turned off.
It's taken the usual 10 minutes to find what should be a simple menu in Visio 2010. Of course, it's on the View menu, silly me, click on the arrow next to Visual aids.
Sounds to me like somebody has been messing around with your Visio installation.