I convinced the local IT guy to install the beta in an unused PC. He
let me install it. I chose not to install Clip Art Organizer. Now in
Excel, when I select the Insert tab in the ribbon, Excel displays an
error dialog with the following text.

Microsoft Office Excel can't display Clip Art.
This feature is not available. To make this feature available, please
run Setup again, select "Add or Remove Features" and change the feature
to "Run from My Computer" or "Run from CD/network".

And with the Insert tab selected, if I just move the cell pointer
around the worksheet, this dialog keeps appearing. When I try to insert
a table, something that doesn't (or shouldn't) use Clip Art, this error
dialog also appears. It seems that anything that triggers an event
causes this dialog to appear while the Insert tab is selected.

>From my perspective, this is either a bug in Excel or a bug in Setup.
If the @#$% Clip Art Organizer is NECESSARY for any selected Office App
to run, it shouldn't be an option not to install it.