Hi Curt,
Thanks for responding.
I had to delete and re-download the blender in Dec so it's the newest version available.
I am using a PC Windows 7 . The problem is with any premix that includes either of the core workouts, for eg. Bi's and Tri's Premix 2, Hardstrikes premix 2, Supercuts premix 2, Burn Sets B8 & Tri premix 2, etc.
I hope this helps.
Lesly