Expected nether reactor created before updating to 0.6.0 to work.

The switch appeared to activate as the core glowed red and blocks changed colour, but the reactor didn't throw out items or zombie pigmen, the environment remained light and steady.

Difficult to replicate perhaps, but try building a reactor, and set it going. Possibly exit and return.

When I hack out the gold and core and replace them, the reactor does fire as expected and seems to throw out a lot more stuff.

When used with the save bug and I rebuild, I can use the reactor multiple times withe the same core, cobbles and gold. Collecting chests full of stuff as we speak ... But even this is getting a little boring.