I have the same problem
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Most likely that .swf compression is enabled on your server. In order to disable it, please add following row to your .htaccess file:
RewriteRule .swf - [E=no-gzip:1]
Or just replace our default .htaccess (located under root directory of your template) with the attached one.
Important! Mentioned .htaccess rule may not work on your server due to configuration restrictions. In this case please contact your hosting provider support team asking them to disable .swf compressing on your server.