Future troubleshooting
GE, in the future, you might consider going back with your scope and checking the signal at the output of each amplifier before you scratch your hair thin. Most likely, you'd have found the signal levels you wanted at each of the outputs and then the low signal at the 100K resistor, clueing you in to the likely problem. In the end, the amps were clipping where they were supposed to be clipping, at around 8.5v or so and then attenuated at the output to that low voltage.
Checking at the output of an op amp will give you all sorts of information as to what may be going on. It's also a nice, low-impedance point that won't be loaded down by anything you'd normally use for test equipment.
Dean