What behavior options in the Inspector, if any, are selected for this field?
DATA TAB: control style "Radio button set", values from a value list, no repetitions, Field entry in browse mode only, nothing checked in "Go to next object using", "Set input method" to Automatic, "Touch keyboard type" to System Default.
APPEARANCE TAB: Normal, Hover, Pressed & In Focus all have the same settings. "Fill" - none, "Line" - none, "Effects" nothing checked, "Text" - Helvetica 16pt, baselines - none.
STYLES TAB: Default
The only thing unusual is that when I select the In Focus state, the box on the layout turns gray in edit mode. The other 3 states don't do this.
I'm not sure of what other behavior you mean other than the script trigger I mentioned in the first message.
Just realized that it also turns gray if you click inside the box without selecting a button. So it is just the in focus like I mentioned above.
"Select entire contents on entry" is not selected under the behavior section of the Inspector's data tab?
The only thing unusual is that when I select the In Focus state, the box on the layout turns gray in edit mode.
That suggests a grey fill color has been specified for the "in focus" state for that object. Try changing the fill color to something else while the in focus state is specified.