Your Flash may be broken on your PC and you may not even know it.
There is a known exploit called "Rosetta" that a Google engineer found several years ago, but Adobe has just recently patched.
The good news is that if you use Google Chrome for your web browsing on your PC, you should be protected, as Flash is updated automatically as it is with Internet Explorer 10 and 11.
The bad news is if you use any older versions of Internet Explorer or Mozilla Firefox you have to manually update Flash unless you have your auto-updated enabled in Flash.
It is also a great idea to check your system version of Flash, too, if you have it installed.
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