WE MOVED!!! See this post on our new blog for the latest on this issue.
In a previous post an issue where PowerPoint hangs while working with charts was discussed. A fix for this issue was originally planned for release as part of the August Cumulative Update. There were problems with the first fix.
There's an updated hotfix, the KB article is:
To get the hotfix click on View and request hotfix downloads at top of that KB article, accept terms, fill out form and submit.