Never used that hazer, but there are some dmx products that need to be completely connected to the data chain BEFORE they are powered up. Have you tried that?
It was working fine during programming and manually bringing up the channel on the board but playing back the cue stack it doesn't seem to want to fire.
I've messed with those hazers before and feel like this is a problem that comes up semi frequently. I've heard random things like add a terminator or plug a DMXline straight into it back to the console. I would say start from there with the DMX or a terminator.
I didn't realize it but I must have another device with the same address and it was interfering with it. I re addressed the Hazer and it is working just great now.