Problem:
You have an PPT file from an older version of MS Office that opens in Office 2007. There are images on the master slide that seem to be not editable. But you can hide them by selecting on “Hide Background graphics”. How do you edit whatever graphics that are controlled by the Background Graphics button?
Solution:
Go to view, slide master then make sure you select the first slide in the list on the left. When you are on that first slide you can select and edit these types of background items.
This is a sample post through pixel pipe to check if pixel pipe can post to self hosted wordpress installations.
*Update* It does work!