I'm having graphical problems using the flash plugin in natty

Hi there! I can't find a way to report this bug. I'm having graphical problems using the flash plugin (10.2.153.1ubuntu1) in Ubuntu natty Beta 1 with the latest updates, and I have this issue with almost every flash applications. It's very frustrating, but I've installed Adobe Flash Player "Square" Preview Release 3 (released: Nov 30, 2010) from: http://labs.adobe.com/downloads/flashplayer10_square.html , and I don't have this problem anymore. I'll put some links with examples, just to show that this web applications are almost unusable. Here are the links:

http://www.loteria.cl
http://tv.digg.com/diggdialogg/marissamayer

This is how it looks with flash plugin (10.2.153.1ubuntu1)

loteria: http://ubuntuone.com/p/lnl/
digg: http://ubuntuone.com/p/lno/

And this is how it looks using Adobe Flash Player "Square" Preview Release 3:

loteria: http://ubuntuone.com/p/lnk/
digg: http://ubuntuone.com/p/lnm/

So please, is there any way to include this version of flash player as an alternative option? or replacing it? Is there someone else experiencing the same problem as me? and how do i report this kind of bugs without using apport?
 I'm using an Nvidia graphics card, and i've tested it using propietary and open (experimental) drivers.