[Gimp-user] open .png shows a checkered background

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i forgot to mention a few other points. when i preview the .png image before i
open it in gimp it show a small pic and it has the checkered background

when the pic in opened in gimp and i add a new layer and set the foreground and
background color to white then select all in the new layer and use the paint
bucket to fill it with color it makes the new layer black. even when white is
chosen for both the foreground and background color. then if i choose to us the
paint brush on the new black layer and again choose white nothing shows as i
paint. i think it's painting black over black. strange.  what would cause all
this?

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