Flash content displays when using http or www, but not when using https

If you take a look at the Networking tab in Chrome's developer tools, you'll see that your server is returning HTTP 403 Forbidden when the SWF is requested.  Consequently, the content is never loaded by the browser.

Something is misconfigured on your server.

I noticed that some other content is also returning 403, like the GIF on this pages, which have the wrong MIME-TYPE configured:

https://www.terezakis.com/index2.html

https://www.terezakis.com/prints.html

Similarly, the SWF is being served as text/html and returning the same error.  My guess is that the server looks at the mime-type associated with the file extension and sees you're trying to serve text content, but when it opens the file, it sees that the file actually contains binary data and throws an error.  Perhaps text/html is the default MIME-TYPE on your server, and you just need to set up the correct mime types for those file extensions?

Hint the right mime types are:

.gif -- image/gif

.swf -- application/x-shockwave-flash

Apache is super flexible so there are a bunch of ways to do things.

Both of these are pretty solid recommendations, depending on your environmental constraints:

apache - Apache2 server mime types - Stack Overflow

apache - htaccess setting the mimetype for a single file - Stack Overflow

Hope that helps!