Look at this interesting problem.
(Somebody help...)

I have imported a .gif in a new movie in frame 1 and i resized it. Then i exported as .swf and the quality of the image was OK.

In the same movie I have added a new blank frame. (only an empty frame!!!!). So: frame 1: a .gif, frame 2: nothing, just the frame. Then i exported/tested as .swf. The quality!? MISERABLE.

I don't know what is the problem.

Can somebody explain to me?