On my development machine my flash project (CS5) works great. It works in all browsers. All tweens and all eventListeners fire 100%.
On my client's machine(s) (with IE7 and Flash Player 10) only SOME of my animations / tweens play and only SOME of my buttons work. Yikes!
On my client's machine (with IE7 and Flash Player 10 AND with "Adobe Flash Professional CS5" installed), everything works fine.
I've tested using just the swf as well using it with the published html.
Help will be highly appreciated!
Ended up being a Flash Player version issue! (were 10.0.... ) Latest Player and all is forgiven.