I just spent _hours_ chasing this one down... I have an mxml component that displays a model. Text fields are editable to allow data entry. If I enter text in field 'a' and hit tab to go to field 'b' - all text in field 'b' is now highlighted. If I then load a new model into the component (I have a 'return to list' button at the bottom of the app), text in field 'b' is invisible until I click inside field 'b'...Once I click on it, the proper text is displayed.
Very odd...