What is my Flash Player version?
Is it up-to-date?

You’re here because you want to know if you have Adobe Flash Player installed in your web browser, and want to know if it’s the most up-to-date version. The panel below tells you if you have Flash Player installed, what version you have, if it is a debug (developer) version, and if there is a newer version available. Although Flash Player is less common on mobile devices, this page can still let mobile device users know whether Flash is available in their browser.

Since 2009, we’ve been helping the Internet know more about their Flash Player installations, and we plan to continue until the Internet stops using it. If you need to install or update your Flash Player version, keep your computer secure and be sure to only download installer files from Adobe’s website. Never accept Flash Player downloads from sites that aren’t operated by Adobe or don’t appear to be authentic.

Have I got the debug player? If the display above says "debug" by your installed Flash version number, then yes, otherwise no. Get debug players from Adobe’s download page.

Why not also check whether you have the correct version of the Silverlight plugin too? Silverlight is used by sites to deliver rich content, similar to Flash