This is with Chrome 18.104.22.168 on Windows XP SP3 and Gravity Forms 1.3.4 and WordPress 2.8.6. Not sure if it existed before or not, I just happened to use this today.
Doesn't seem to matter the number of fields in the form that you have to choose from (i.e. long or short list here) the upper right corner of the button is masked by something from above. Look fine in Safari, FF and IE8 on XP.
Just FYI. Doesn't hurt anything.