well wen i save my anamated sig in gif it is asking me if i wanna flaten all layers and dicard animation but i cant say no only yes/cancel
when in Imagereaady make sure in the top right hand corner it says GIF and then File Save optimised as and then save as GIF file hope this sorts out your problem
oh ffs i jsut relized its been a wile sinse i made anamated rofl... i was opening it into photoshop =s