I have one of the more odd situations I've run into, and of course it's on my computer vs one that I'm trying to repair.
Keyboard inputs don't get recognized within some flash games.
Have Win7 x64 with a Microsoft Sidewinder X6, also have a Nostromo. neither will work singularly, neither will work together in several flash games.
They do work in some, just not all.
Have tried to update drivers, have tried checking in device manager and uninstalling both then reinstalling each individually and they continue to do similar within those. Have a similar problem in Firefox as well as Chrome.
Flash version is: 10,3,181,26
problem also exists in Duke Nukem Forever, but although the problem is similar, I think it's a distinct problem there as some inputs work and all inputs work in some instances but just in gameplay that it isn't working and allowing me to move and/or control
two examples of ones that don't work, and one that does:
disconnect ALL input devices and use just the keyboard and mouse and see how it behaves
games sometimes prioritize gamepads and similar devices over keyboard and mouse and the direct result is the keyboard now working within games
on the other hand you will probably notice ALT+TAB will still work
have done as you suggested there, used each keyboard, ensured that drivers were unloaded for disconnected items, and checked, and also have tried it with neither, using a secondary keyboard that didn't have as many functions as my primary does, and that doesn't work as well.
Have tried multiple browsers and nothing changes the problem.