I've tried this before several ways, figured I'd ask this time - taking a simple surface, I attempt to extrude it and MOI appears to cancel the operation

The simple video of what I'm doing can be watched here (not sure how to embed or attach stuff here):

http://www.willbelljr.net/public/MOI/ExtBug01.html

Basically I create a planar surface and go to extrude it but nothing happens.

The .3DM is here as well:

http://www.willbelljr.net/public/MOI/ExtBug01.3dm

Any explanations for this is appreciated!

-Will