When Reader 9 starts up, by default it clicks the Highlight Fields toggle button. In Reader 8, this was unchecked by default.
In general, this is a good thing. It makes it much more obvious to end-users which documents are fillable/editable PDFs, and which are plain PDFs that can only be printed.
However, in some cases, where your user-base is already expecting fillable forms, this means that all your carefully color-coordinated forms now dont look as good on startup.
Another issue is when you have required fields, which show up with red borders - apart from looking a bit garish, our usability testing has indicated that it can make new users freak out, thinking theyve already made a mistake before theyve even done anything.
This is compounded if you have fields with caption above the field, which in Reader 9 is rendering as two red borders.
There is a very simple way to preserve the Reader 8 behavior. Here's how: