i dunno if my computer is screwed up but when i looked at your fla i saw the rotating when i tested the movie but whne i looked at the motion tween it didn't say rotate and also i coudn't find any actions on it very strange i think my comp is screwed up well this method right here doesn't use any thing but 3 lines of script
code:
onClipEvent(enterFrame) {
this._rotation +=4;
}
you can change that number to make it go faster of slower here is the attached fla i made real quick