Having trouble previewing my website on Safari and Firefox from Dreamweaver CS5

Hi,
I previously built a website using Dreamweaver version CS3 and it ran well.  Now that I I have upgraded to Dreamweaver CS5, I'm having trouble previewing the menu text on my website and flash picture text.  I'm using  an Apple operating sytem (10.6.8).  While previewing the web page On Safari and Firefox within Dreamweaver, my menus and the flash picture text have not shown up and the main page contained an error that says:
"Adobe Flash Player has stopped a potentially unsafe operation.
The following local application on your computer or network:
null
is trying to communicate with this Internet-enabled location:
s.ytimg.com
To let this application communicate with the Internet, click Settings.
You must restart this application after changing your settings."
Can you tell me what I do to correct this?

This is often related to embedded YouTube videos in your webpage.
See http://forums.adobe.com/thread/499751
"This warning is talking about the Flash Global Security Settings Manager. This is not a virus but rather a very common security step related to allowing Flash to connect to the Internet while testing on your local machine. This only occurs during testing on your local machine and does not come into play when that same Flash object is on the Web page on the server.
The Settings Manger allows you to "approve" connecting to the Internet for a particular Flash object.
http://www.macromedia.com/support/documentation/en/flashplayer/help/se ttings_manager04.html
So go to the Settings Manager, Click "Edit Locations" or "Add Location" and browse on you computer for the Flash file that you are giving permisssion to connect to the Internet. Each Flash object that attempts to access the Internet will need to be given permission separately.
Kind of a pain... or just upload your Flash to the server and test from there, then it's not an issue."
and http://grandstreamdreams.blogspot.com.au/2010/07/firefox-and-flash-security-warning.html

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