Normally i export image slices as PNG files using right menu -> 'Export selected slice...'.
Now the thing is that after i finished a new design... it only allows me to export the slice as GIF!!. And all the slices are marked as 'Foreground image: GIF' and i can't change that :/..
In different files all is working as allways, but not with this file... what's wrong?
Thanks for reading
Select the slice you want and press f 6 to open the optimize panel. Use the drop down menu to change from gif to png. Hope that works for you.
I was looking the Properties panel, and didn't noticed about that 'optimize' one.