I have been using After Effects regularly since 1995. So this isn't an operator error.
I am on a new Mac Pro six core with OSX 10.9.5 and 32 gigs of RAM.
Is anyone else having trouble with activating frame blend and motion blur?
Occasionally I am able to get the global switch to appear to be on. It still won't activate motion blur or frame blend.
I'll answer my own issue. The global switches actually work. The distinct dark boxes that indicate when the global switches are enabled have been removed and replaced by a light blue outline of the switch icon.