Extension no longer shows in Photoshop after updating to Photoshop 13.0.1

I develop a commercial plugin for Photoshop, last weekend I had a few clients update their Photoshop CS6 (Mac) to 13.0.1.  Once they did this, the plugin is no longer is listed in the Window > Extension list.

I then updated my Photoshop CS6 to 13.0.1, and tried to debug using Creative Suite Extension Builder 2.0.  The extension never shows up and I cannot open it.

Please advise.

Cheers,

Nate