Well… I don’t know why, but there is apparently an unexpected interaction between text formatting and the ‘area’ of a textbox.
The problem is most noticeable when using ‘bulleted’ or ‘numbered’ lists, PLUS a color gradient background to the text box area. Variations in the gradient configuration seem to affect the text animation symptom (noted in my previous post) in various ways.
When the textbox area background is set to ‘none’, the text animation works normally.
With unbulleted / unnumbered lines, the animation works properly with some textbox area color gradients, but not with others. (The slides in question may also have color gradients set in the slide background. So, perhaps there is a conflict between the two gradient schemes?)
The line indent on the unbulleted / unnumbered lines is set by adding spaces, because the indent box seems to be greyed out sometimes.