I found a PNG pixelated image on the net (16*16) and under the "Filters" blur effect are grayed out and unclickable. Even when I size it up it still doesn't get blurred (which happens by default). I'm using a Gimp version on Edubuntu titled "2.2.13-1ubuntu4.4 (gimp)" and I'm not able to install a newer one. So far this is the only image where some features doesn't seem to work. I reopened it a couple of times and it's always the same. What seems to be the problem?