Ok tks Barb.
Potterdog I'm not a MAC user but did a bit of research on the net and came across these two pieces of advice:
1) If you set your new SL Safari to launch in 32-bit mode (you can do so in the Info Window), everything works fine!
2) I did a reformatting of the disk, and installed Snow Leopard as a clean install, and restored my Accounts, Settings and Applications from my "Carbon Copy Cloner" (CCC) backup using "Migration Assistant". Everything, including Real Player and BBC iPlayer worked fine without having to set Safari to 32-bit mode!
Maybre one of these two things will help. Let us know.