Help with Fading Text

I’m sure this will be an easy question for you guys out there but I am 2 days into learning Flash MX. I have gone through a few tutorials and managed to create a few movie buttons and the like. I just finished the fading text one and wanted to try a logo instead of straight text. I exported the logo out of Corel Draw as a PNG. I placed a STOP to allow the logo to fade in and stop but the logo has sudden “shake” on the last frame. Any idea how to fix this or what is going on? Thanks in advance.