Internet explorer 11 flashplayer stopped working

If you just upgraded to IE11, the following might be useful:

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First, confirm that ActiveX Filtering is configured to allow Flash content:

https://forums.adobe.com/thread/867968

Internet Explorer 11 introduces a number of changes both to how the browser identifies itself to remote web servers, and to how it processes JavaScript intended to target behaviors specific to Internet Explorer. Unfortunately, this means that content on some sites will be broken until the content provider changes their site to conform to the new development approach required by modern versions of IE.

You can try to work around these issues by using Compatibility View:

http://windows.microsoft.com/en-us/internet-explorer/use-compatibility-view#ie=ie-11

If that is too inconvenient, using Google Chrome may be a preferable alternative.

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If you're on IE11 on Windows 8 and higher and it *was* working, then stopped, that's pretty weird.  Either you've changed something or installed software (Ad blockers, privacy tools, etc) that are preventing Flash from running, or something got corrupted on the filesystem.  The best way to fix that is to find the last windows update in Add/Remove Programs for Internet Explorer and uninstall it, then re-install it from Windows Update.  This will usually get things back to a working state.  Unfortunately this is a difficult solution because there's no way to uninstall and reinstall Internet Explorer itself on Win8+, and Flash Player is actually a built-in component of IE at this point (there's nothing to download from Adobe).