I dont really know bruno, i dont use pronto software. One thing to look at is to make sure that your buttons are set to the size of the button graphic. What i mean is lets say your graphic is 50X50 and the button is 40X40. With some software i have found that the button looks fine in software but when loaded to the remote it wont show the graphic because the button isnt physically large enough. Some software will re-size the button to fit the graphic. Some software wants you to do it with a re-size tool and some software forces you to go in an manually set pixel size.
Avid Stamp Collector - I really love 39 Cent Stamps