I don't know if this will help you, but I've noticed that if
you go into Flash and copy multiline text from a dynamic text field
and paste it into notepad, there is a funky linefeed character that
they use. I can't paste the character here because it registers as
a linefeed. Nevertheless, if you can discover the ASCII code for
the character, you may be able to check for it with ASP.
As a side-note, you can also paste the linefeed character
into a text file and load it with loadVars. Or you can paste it
into an XML file and assign the nodeValue to the text field. In
either case, the linefeed character will appropriately go to the
next line in a dynamic text field.
in flash, you can replace the carriage return/new line with
any unique character and then replace that unique character in your
asp script with a carriage return. for example, i like to use a