Thanks for your help Vikram. But Enable plug-ins¹ is already ticked.
Open Mac HD > Library > Internet Plug-Ins > Delete any files called Flash Player.plugin that weren't created today.
Note : You might need to use Go -> Go to folder (/Library) to access Library folder
Thanks again Vikram. I did that, leaving the one that was dated Today
7.40am¹, but it is still no good. As a test, to see if the problem is with
me or the site, go to www.h28.com.au and see if the first what looks like a
picture area at the top, comes up with Blocked plug-in¹ for you. If so,
it¹s the site¹s problem. If not, it¹s mine. But these Blocked Plug-ins¹
have been coming up a lot for me, not just on this site. Regards, Lance.