Do you have any actionscript in your animation? It might be possible that you have caused an infinite loop and that would certainly mess things up. If so, put some trace statements in your code. If you see the debug console go crazy, repeating the same sentence, you have an infinite loop. Also, try the debug mode as you can try stepping through and see where you get problems.
Just to add clarification, an inifite loop is something like this:
Code:
// X starts off at 10
x = 10;
// While X is greater than or equal to 10, do the stuff in the brackets
while (x >= 10) {
// Add one to X
x++;
}
// Will never get to this point as X will never be less than 10.
P.s. Love the name