I have a logo that "rolls" into view from the left side. (click link below to see it yourself)
That works fine, however if the user has the mouse in that area of the screen the move-left animation stops and that looks a bit strange. I suspect this is because I also have a on-hover animation attached to the same object.
To test, reload page and have the mouse top-left where the logo rolls in - for me it stops and disappears.
To test the other animation (that might interfere), let it roll to it's place next to the text and click it.