Pedro147 are you sure about the 1K resistor value? seems very low compared to the mine and defined with the datasheet. (page 11 where 9.69K is the lowest value defined for 3.5 Vf voltage and 40mA If current ) -> 1K is very low! and give very high current (can destroy the led and/or the chip)
the value is 62K from the hardware schematic/BOM from the website where you can find the library:
http://parola.codeplex.com/downloads/get/761595