# Good when testing - bad when previewing -Why?

**URL:** <https://forum.kirupa.com/t/good-when-testing-bad-when-previewing-why/188431>\
**Category:** Uncategorized\
**Created:** [May 7, 2006, 10:04pm UTC](https://forum.kirupa.com/t/good-when-testing-bad-when-previewing-why/188431 "2006-05-07T22:04:55Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ovidio](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/ovidio/32/2379_2.png) [@ovidio](https://forum.kirupa.com/u/ovidio)\
**Post date:** [May 7, 2006, 10:04pm UTC](https://forum.kirupa.com/t/good-when-testing-bad-when-previewing-why/188431/1 "2006-05-07T22:04:55Z")

</div>

I’m loading a [COLOR=“Red”].swf[/COLOR] with “loadMovie” into a [COLOR="#ff0000"].fla[/COLOR] and then I’m trying to change, from the loaded swf, \_alpha of a movieClip delared in the root of the fla. I use : [COLOR=“Red”]\_root.myMovieClip.\_alpha=value;[/COLOR] and it works when testing the movie directly in the flash player but not when previewing it in the browsers ( any browsers).  
Does anyone have an explanation for this?  
Thanks