Originally Posted by UNeverNo
Well all Nexus 10 should be the same - so there have to be a software issue with my device.
I enabled it at my first try and double checked it now.
Hmm .. Have you rebooted your N10 lately?
Maybe try uninstalling flash. Reinstall the .apk I posted. I'm not sure what could be stopping it from getting flash working.
I guess you could try a factory reset to see if that helps, but there's no guarantee it will.