Trouble testing capacitor
I doubt you have bad caps. 100uF is a lot, the meter could just not have the resolution to read the amount of charge it's pumping into the cap. If you have a function generator handy you could measure the capacitance by applying an AC signal to the cap in series with a resistor and see where the voltage amplitude falls to 0.701 of the original value (which is your RC pole). 

In terms of what's wrong with your meter, it might just be too large. Try testing on increments of larger caps going up from 30uF.