# I want to use MC tween, but it isn't reliable. Thoughts?

**URL:** https://forum.kirupa.com/t/i-want-to-use-mc-tween-but-it-isnt-reliable-thoughts/254571
**Category:** flash
**Created:** [March 13, 2008, 9:08am UTC](https://forum.kirupa.com/t/i-want-to-use-mc-tween-but-it-isnt-reliable-thoughts/254571 "2008-03-13T09:08:25Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![dtrace](https://avatars.discourse-cdn.com/v4/letter/d/59ef9b/32.png) [@dtrace](https://forum.kirupa.com/u/dtrace)
#### Post date: [March 13, 2008, 9:08am UTC](https://forum.kirupa.com/t/i-want-to-use-mc-tween-but-it-isnt-reliable-thoughts/254571/1 "2008-03-13T09:08:25Z")

</div>

I have been using the MC Tween class, and it seems to work really well, doing everything I tell it to. Locally, that is. But when I post it up online, it is unreliable, and sometimes just doesn’t work.

I have a big site that basically has one main swf and then calls in other swfs. When the other swfs get called in… I typically have movie clips in them that have ,

```auto
onClipEvent(load) {this._alpha = 0; }

```

And then I tell them to… alphaTo(100,.4,“linear”);

or something similar to that. But it doesn’t always work. And I can’t figure out why. One thing I have been doing is…I am ‘including’ the mc tween class in each swf. Do I only need to include it on the main swf once? Does it perhaps hurt me to put the include code on every sub swf?

Please help. I am at a loss with this one.