Powerpoint animations

I'm wondering if there is a limit to the number of animations that can be attached to a textbox on a slide? I had three and put a fourth on with a trigger and could not get the trigger to work except at the very beginning of the slide's animation series. I want the trigger to work anytime it is clicked. I got around it for now by copying the text box and putting it directly over the other one. They are both off screen and the animation is a line slide into the picture upon clicking the various triggers. Any help MUCH appreciated.