Security sandbox violation inside one domain?

[SIZE=2]good night
for some time i used a contact form in a flash website, and all worked well.
then suddenly, when i tried to submit it i got the following error (i replaced my domain name with “domain”, for paranoiac reasons):

[/SIZE] [FONT=Verdana][SIZE=2]Warning: Failed to load policy file from http://www.domain.com/crossdomain.xml[/SIZE][/FONT]
[FONT=Verdana][SIZE=2] [/SIZE][/FONT]
[FONT=Verdana][SIZE=2]*** Security Sandbox Violation ***[/SIZE][/FONT]
[FONT=Verdana][SIZE=2]Connection to http://www.[/SIZE][/FONT][FONT=Verdana][SIZE=2]domain[/SIZE][/FONT][FONT=Verdana][SIZE=2].com/contact_parse.php halted - not permitted from http://[/SIZE][/FONT][FONT=Verdana][SIZE=2]domain[/SIZE][/FONT][FONT=Verdana][SIZE=2].com/pages/contact.swf[/SIZE][/FONT]
[FONT=Verdana][SIZE=2] [/SIZE][/FONT]
[SIZE=2][FONT=Verdana]Error #2044: Unhandled securityError:. text=Error #2048: Security sandbox violation: http://[/FONT][/SIZE][FONT=Verdana][SIZE=2]domain[/SIZE][/FONT][SIZE=2][FONT=Verdana].com/pages/contact.swf cannot load data from http://www.[/FONT][/SIZE][FONT=Verdana][SIZE=2]domain[/SIZE][/FONT][SIZE=2][FONT=Verdana].com/contact_parse.php.[/FONT][/SIZE]
[FONT=Verdana][SIZE=2] [/SIZE][/FONT]
[FONT=Verdana][SIZE=2]Error: Request for resource at http://www.[/SIZE][/FONT][FONT=Verdana][SIZE=2]domain[/SIZE][/FONT][FONT=Verdana][SIZE=2].com/contact_parse.php by requestor from http://[/SIZE][/FONT][FONT=Verdana][SIZE=2]domain[/SIZE][/FONT][FONT=Verdana][SIZE=2].com/pages/contact.swf is denied due to lack of policy file permissions.[/SIZE][/FONT]
[SIZE=2][FONT=Verdana]I went and looked up this crossdomain.xml, and found out it is only used for… cross-domain communication.

why, especially so suddenly, is this policy required when communicating within the boundaries of one single domain?

if anybody knows i will be very grateful
thanks,
again good night,
michael
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