I'm using a Helios DAC, the laser isn't showing what the screen shows, instead I get a pattern that  changes every 3 to 4 seconds. I thought this was the slow Galvos installed in my laser, but I've now tried with different Galvos running at 30kpps and get the same thing. Any ideas where to look for the problem?  This is on my Macbook Pro as my PC won't run Maxwell.