Just as everyone else, would like to thank you for this awesome class. I use it for http://preloaders.net , but recently I found out that the class has a glitch with empty frames. I send several frames and one of them is completely empty and transparent, but the class fills it with white color for some reason and it blinks because of this.
I tried to fix it myself, but the best I could do - I removed the 186th line ($this->GIF .= ( $Locals_ext . $Locals_img . $Locals_tmp );) which simply excluded the empty frame.