gmm2 posted at 4:43PM Thu, 07 January 2016 - #4247802

I've had to delete the preference files a few times due to various issues, so that's probably the cause. I don't really care to get it back because it's such a small deal.

In a roundabout way that ended up being helpful, so thank you, Crystal.

Ahhh, I suspect it's the following setting:

In General Preferences>Library Tab>Double-Click Behavior>Add to Scene/Replace Existing

Mine is set to Add to Scene

And, you're welcome.