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There is one possible reason for this if you use Google Chrome, and that is that there are two versions of Flash "competing" on your system. This happened to me recently and caused the above issues.
Chrome updates Flash automatically BUT, if the Flash on your PC isn't up to date it can sometimes leave in a ghost second version that causes issues. Removing this means going into the bowels of Chrome but trust me, it's nowhere near as hard as you think.
First, click on the address bar above the window and type in - chrome://plugins/ (note the colon in the middle).
Scroll down the list until you find Flash, on mine it's the first item. Check and see if there are two versions with different numbers, most likely 11,1,102,63 and 11,1,102,62.
Now disable the one with the SMALLER number, most likely 11,1,102,62.
Reload Chrome.
Hopefully, if fingers were crossed and deities prayed to this may have helped your game along!