A client sent me a powerpoint with revisions from last year's version. Over the year, they must have found the "Animation Schemes" button because the presentation was filled with animated text. When I exported the presentation I found that most but not all of the text had gone jaggy.

A quick search of Googleprovided a clue on the Powerpoint for Mac webpage, even though I was using the PC version. In the section on making Powerpoint Movies on the Mac, it noted that "Antialiased text loses its antialiasing if the text is animated."

I went back to the presentation. It wasn't enough to select all slides in the left column and click "No Animation - Apply to All Slides" under Animation Schemes.

By each slide icon in the left column there were still tell-tale animation icons (the little star). I had to select the Custom Animation Pane (in the right hand task pane) go into each slide and select and remove all the animation effects shown in the task pane.

However it was worth it. Now all text comes out clean when published to the web.