Mozilla 1.7 (RC1 and RC2) and strange GIFs

Hi,

with Version 1.7 and higher (RC1 and RC2) I got on some WebPages
some GIFs which are not displayed correctly.

They look like if they are interlaced, but in the GraphicConverter they
would be displayed correctly.

A sample Picture can be found at:
< http://www.macuser.de/forum/images/on.gif >

This pictures did work fine through Version 1.6 of Mozilla.

Is this a local problem on my Cube G4 or could you see this pictures
like me?

Bye from Germany
Guido.