your embedding html looks suspect.
publish an html page using flash and upload it and your swf to confirm the html page is the problem.
sorry. not certain of how to do that.
I have tried updating flash in several pages with different images and having all the same results.
When I set the other older flash file I created using CS5 into the same page it works. Not certain what is going on.
If I publish it on my home computer it works on my computer just not once I imbed it into the page and upload it.
open your fla is flash pro.
click file>publish settings
tick swf and html wrapper
upload the newly published swf and html to your server.
open the newly published server html using your browser.
any problem? if yes, post the url to your newly published html.