Hmm, I've tried a TL072, JRC4558D, 2 TL071s, carefully rebuilt the entire breadboard each time, accounting for the pinouts between single and dual opamps. The single OAs give me a constant 4.5v at output, the duals give me a constant 8.25v at output.
It's frustrating to be beaten by such a seemingly simple circuit when I've successfully built ones 10 times as complex, in terms of parts count. I seem to have bad luck with oscillators though...