I'm trying to do something relatively simple... in theory.
I have a movie clip on the main timeline that I want to alpha tween from 100% to 0% over 8 frames. Now if I use the AS Tween class, it does just that, no problems with that.
However, if I attempt to do the tween using the timeline, it doesn't tween at all, it doesn't even acknowledge the alpha property on the keyframe, it just stays at 100%.
I don't want to use AS tweening as it's for running on specific hardware that doesn't lend itself well to anything that runs using a timer.
What could the problem here be?
It's pretty straight forward... I attached what I am thinking you're trying to do. Is that right?
I found the problem - the movie clip is positioned by the user entering the X and Y positions in an XML file, and when the position was set it seemed to conflict with the timeline tween - removing the positioning code made the tween run just fine.
I did end up using the AS tween, it's just that we use very, very specialised hardware and there was no precedent for AS tweening being used, we try to alleviate the load on the CPU wherever possible. Thankfully it runs without any issue.