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There are already topics discussing about those changes in how Flash is handle in Opera.
There are many posts refering to Flash problems.
Search them and try its workaround options, maybe fix your case.
Windows 10 (x64) | Anniversary Update
Opera Stable · Beta · Developer
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@magicgalaxy First of all you should read the forum rules as the title of this topic is invalid and also there are already topics opened about the changes on how Flash will work from now on Opera and other Chromium based browsers.
There's a topic for it already.
It is Windows 10 fall creators and Opera developers last version 50.0.2753.0
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