Problem with using swc files in Flash Player 10

Question

I have two Actionscript projects in Flex. One is using Flash Player 9 the other is using 10.  Both projects use the fl classes specifically FLVPlayback.
In the Flash Player 10 project I am using the recently released version 2.5.  Both players use individual controls instead of a complete skin swf.  So the code goes something like video_player.playPauseButton = playPauseBtn.  All the swc files are imported through properties-ActionScript Build Path-Library path-add swc.  This all works great in both projects exept in the Flash Player 10 project the volumeBar swc does not load properly.  In the debug variables for a break point at the function below in FLVPlayback.as the variables handleLeftMargin, handleRightMargin, handleLinkageID and handleY are missing even though they are all in the original fla used to compile the swc.  I have tried compiling swc in both Flash CS3 and 4.  I have tried moving the Actionscript inside the fla files but nothing changes. This leads me to believe it is a bug in the Flash Player 10 or the version 10 playerglobal.swc since this part of FLVPlayback.as is identical in versions 2 and 2.5. The result is that only the volume bar renders but no handle. Debugging all through fl.video.UIManager.as handle_mc remains null?
       public function set volumeBar(s:Sprite):void {
            uiMgr.setControl(UIManager.VOLUME_BAR, s);
In the Actionscript 9 project all the variables are accounted for so the volume bar and handle render and work fine.

Answer 1

Further info for anyone who can help!
I am opening a session from a server via the following sql
statement:-
http://servername/virtualdirectoryname?sql=SELECT
* FROM table1 for XML auto&root=root"
I only get the popup window when trying it out from our
webserver?
The server is MS SQLServer
The virtualdirectory is created with access set as Windows,
and always log on set as "myusername" + "mypassword"
So I thought (hoped) I could pass the "myusername" +
"mypassword"
bits into the above sql statement (maybe appended at the
end?)
If I type the above sql statement into a browser it works
perfectly with the xml returned in a web page,
also as I state above, when I run it from within my flash
prog on my local machine it runs OK and returns the results into
the text area specified within the flash prog.
BUT - When I upload my flash prog to the webserver and try it
from there, I get a windows popup asking me for username + password
+ domainname.
any ideas please?