click file/publish settings/formats and tick html and swf (if they're not already ticked) and click "use default names".
click file/save as and navigate to a directory where you want your fla, html and swf and that you can find again and click save.
now open the html in the directory where you saved your fla.
My apologies, this is not a flash problem. I have now noticed it happens with all HTML files, hence, it is either a windows problem or a Firefox problem. I am in the first instance reinstalling Firefox.
Thanks for trying to help
1 person found this helpful
it looks like you're running an apache server that's not configured correctly.
to test your files you can shutdown your server or upload to another server and test.
p.s. please mark this thread as answered.