Error setting analog reference for Tiny-2

[EclipseBoom]

Using an Tiny826 chip and the latest core version on Arduino 2.3.3

When setting the analogReference I sometimes get a compilation error "Implicit Definition" or "Undefined symbol" i.e.

analogReference(INTERNAL2V048); // set reference to the desired voltage, and set that as the ADC reference.

Work Around:

By selecting a different family in the IDE Board Menu such as ATTiny3227... and then reselecting the correct family and chip. The compile will work properly and will continue to work properly. Seems like the correct analogReference option set is not being set properly the first time.