This is a known issue, see XP/Vista: Flash PPAPI plugin 22.214.171.124 doesn't work in Opera and Chromium. For now you can uninstall the Flash Player and download the previous version Flash Player(fp_126.96.36.199_archive.zip) from Archived Adobe Flash Player versions page, extract the zip and install flashplayer22_0r0_209_winpep.exe present in 22_0_r0_209 folder.
While installing make sure you select "Notify me to install updates" options so that Flash Player is not autoupdated.
With My OS being Vista, It appears I am only able to have Opera 36.0 on my system. Following advice given I have downloaded Flash Player(fp_188.8.131.52 and am now able to view content I wasn't able to before. I worry though that in doing this I am at greater risk of my computer being exposed to all kinds of viruses and malware, so can somebody tell me please when the latest version of Flash Player will be released that addresses the problems afflicting Flash Player when used in conjunction with Opera browser. Thank you.
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This issue is fixed in the latest release 184.108.40.206 released today.