Hi John ,
Are you using leopard OS on Mac , and menu used are 16:9 ?.
There was a issue specific to leopard in CS3:
When Encore project is created on Leopard, Button highlights do not show on 16:9 menu buttons when played on set top box.
This issue was Mac leopard specific in CS3, for 16:9 menus highlights were not visible in 4:3 monitor, they work fine on 16:9 monitor.
The disc does show problem when playing on 4×3 monitor. Has no problem to play on HD monitor or software players. The problem was the sub picture weren’t generated for letter box case.
This issue is fixed for CS4.
You can try on 16:9 monitor. Please respond if your issue is resolved.
Thanks
Minu