Tried all things suggested from previous threads.
Deleted all references in OSX and re-installed several times - No luck
Logged in as another 'Admin' user - No luck, same 'Plugin' failure
Downgraded to previous version of Flash Player - Worked a treat (until yesterday when Apple completely blocked the previous versions due to security issues)
Looked at the suggestion of removing 'Safari' completely and re-installing - That doesn't appear to be possible on Mountain Lion 10.6.8
Any other suggestions would be greatfully recieved.