Step one in cuelist chase pauses - why? Arg!

Hope someone can help. I am in the middle of programming a show on a Hog 500 (latest release) and created a simple cue list. I set the options to chase, which works, but the first step fades in instead of snapping when the chase loops. All the cues have a time of 0.
There are 4 cues, each recorded with 8 MAC 250s at full. I then went back and closed the gates to make a gate chase using merge. Works fine, except that silly fade on the first step. Any ideas? What am I doing wrong? Help! Thanks for any assistance!
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