I've discovered a couple things that are quite strange:
* Question label word-wrap option
- In the Manage Dynamic Questions -> General Settings, the toggle (checkbox) options for "Word wrap field label?", intuitively speaking, if one ticks the checkbox, then it should mean that word-wrap is on. But in the actual case with Dynamic Forms version 2.3, ticking would disable word-wrapping and unticking it would enable word-wrapping.
* Custom Style Sheet
- One must turn on (select the radio button for) Custom Style Sheet in order to use the built-in Dynamic Forms style classes, even if the classes are used in the external style sheet (ie, skin.css). If the Custom Style Sheet is not turned on, then the style definitions for the built-in classes do not work.
jc