Just to add to Ray's post...he PC and Flash point of view.
The files act as they should when viewed locally...the variables are passed and all is good...but when uploaded to the server, which also holds the MySQL DB and the PHP3, the variables are not getting through.
The swf has a detection script to check that the variables are being loaded before the call is made on them, which again works locally.
If I create a .txt file with the same variable string as is being produced by the PHP page it works fine...so is the blockage being caused by the PHP string not being interpreted as a text string?
I have checked Macromedia technotes and various tutorials and I can't see a problem with what I am trying to achieve.
Any ideas greatfully received as I am about to go and find a large brick wall!