# Do differences between a Flex swf and a Flash swf exist?

**URL:** <https://forum.kirupa.com/t/do-differences-between-a-flex-swf-and-a-flash-swf-exist/300303>\
**Category:** flash\
**Created:** [November 18, 2009, 10:24pm UTC](https://forum.kirupa.com/t/do-differences-between-a-flex-swf-and-a-flash-swf-exist/300303 "2009-11-18T22:24:05Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![ockky](https://avatars.discourse-cdn.com/v4/letter/o/278dde/32.png) [@ockky](https://forum.kirupa.com/u/ockky)\
**Post date:** [November 18, 2009, 10:24pm UTC](https://forum.kirupa.com/t/do-differences-between-a-flex-swf-and-a-flash-swf-exist/300303/1 "2009-11-18T22:24:05Z")

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So, I’m working on a project where I am attempting to replace an old AS2 swf with a new AS3 swf created via flex. The newly created AS3 swf has the exact same name as the AS2 swf, so that i can just copy the new swf over into the project and BAM, it just works. Problem is, it’s not working … my flex app currently is a blank App with a red background, nothing complicated. I can open the swf off my desktop just fine, it’s a nice big red screen. However, once i load it into the project, no red screen ever appears, nor do any of my traces. ☹

So, as a test, i created a swf using flash (AS3 & same player version 9.0.124 as my flex swf), of a nice green box, copied the swf into the project, and of course, it loads just fine. I cannot for the life of me think of anything that could be causing one to load, and not the other…especially since the names are exactly the same.

I will say that SWFObject is being used in this project, but surely that wouldn’t affect the flex swf right? especially since i dont care about using history.js or FABridge.js

So, has anyone experienced this or able to think of a reason why this could be happening?

Pretty sure the only solution at this point is a sauntering-iron to my face ☹

UPDATE:  
Turns out some javascript called Tapestry was causing all of my problems. Apparently, it will stop a flex built swf on the 1st frame. It makes no sense to me, but that’s what’s happening. Right-clicking the swf and selecting ‘Play’ will then display the content of the swf.