The problem is not the flash.
If your output from the server does not look like variable=content&variable2=content2 etc., but rather contains other strings etc., falsh cannot assign the values correctly.
Free hosters often prepend your output with advertisement, so your output looks like:
<div>some advertising stuff</div>variable=content&variable2=content2 etc.
this is not readable.
Only solution is a hoster without modification of output.
Usualy this means, paying at least a little for hosting - free hosters have to refinace somehow
