imagettftext not working in wp 3.3.2

i develop a plugin, and i used the watermark function. in particular i used the function “imagettftext” . in wordpress 3.3.1 it work well, but in version 3.3.2 it don’t work. i don’t know why, really it create the image but don’t write text on image. thios is the code https://pastebin.com/RpVvh0sE . thank you