Okay im not too sure if this is the problem but I hope it works for you as this happened to me.
Depending on which browser you have (I use Chrome) Go to the Settings which you will find under the menu button in the right hand corner of your browser (If you are using Chrome)
And then on the left hand side you will see a list of options:
You want to click the Extension button and a page will open up.
Once this have done this you should see "Flash Extension" Or "Adobe Flash somthing" Whatever it called.
Just click enable and refresh your browser and it should work!
If this helps your welcome!!