After applying Studio '13 Update 3, I get "Error found..." in PPT

My PowerPoint 2013 was working fine prior to the update. I updated this the day it was released, and when I open PowerPoint, I get the following error:

Title bar: Custom UI Runtime Error in articulate

Error icon: Big Red X

Text of error:

Error found in Custom UI XML of "C:\Program Files\Articulate\Articulate Studio\articulate.ppam":

Line: 2

column: 153

Error Code 0x80004005

"PowerPointPageSetup" is not a repurposable command. Only "button", "toggleButton" and "checkBox" can have onAction callbacks in <commands>.

This occurs on a PowerPoint that has no articulate features and that I created several months ago.

Suggestions?

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