Using Win 7 Pro (64-bit) and IE 11...newest flash player installed but content unavailable on website after logging in...

No, there's a huge number of people on Win7 and we spend a lot of time testing it.

I'm assuming you successfully ran the Flash Player installer from http://get.adobe.com/flashplayer from both browsers and they successfully completed, but sites you visit aren't detecting Flash Player.

For Firefox, do you have any plug-ins installed that might interfere with Flash content loading?  Ad-blocker, Anti-Tracking Plug-ins, Download Flash Video plugins, etc?

For IE, check the following:

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.