Pi Zero + DAC pHAT + Neopixels

Hi,

I seem to be having some trouble getting my Pi Zero to use a DAC pHAT at the same time as driving some NeoPixels.

I'm using GPIO 13 for the Neopixels via the AdaFruit python library. as far as I know, that doesn't clash with the DAC pHAT (which uses GPIO 19). And both work independently, but as soon as I try getting them both working, the NeoPixel library locks up on a call to show().

Has anyone else ever had a similar problem?

saul