Minor detail, major cause!
My task/The underlying problem: resize an already animated gif using Photoshop for Mac and save it so it won´t loose all of it´s frames and still runs afterwards. I used Photoshop for Mac CS 5.1 cdahl4 sent me following instructions for Windows and I added my findings for Mac users:
Using PS, you need to drag the gif onto the open PS window. It will load each frame as a single layer. You'll need to resize, and save each frame individually.
(The Macintosh PS version resizes all frames by one command only).
When they are all resized, close the giff you have loaded. Then, drag in all the resized frames, one right over another.
(No need to do so using PS for Mac)
Using the Animation view, there it a small triangle in the top right corner
(PS Mac version doesn´t have that symbol, the frames will load automatically) of the animation window at the bottom of the PS frame. Click it. You'll see an option to Load Layers as Frames. Click it. You should now have all the layers as cells at the bottom of the panel. Now it's a matter of playing with the timing of each one.
For Mac Users: If you are done and in order to save your animation you have to use:
"Save for Web and Equipment" menu.
There, especially if you have very few frames, you have to switch to "Endless running" using the data field down right your menu window. In contrary to Fireworks that function is part of the "save as" menu.
Save as gif and running endless.
I missed the running endless option.
Thank you very much again cdahl4!! 
