DL3 Layer Issues

Howdy.

Couple of things. 4 DL3's. 4 graphic layers. Collaged in a 4 x 1.

Cue 1 Graphic Layer 1 intensity at full time 3.
Cue 2 Graphic Layer 1 Intensity to zero Graphic Layer 2 Intensity to full time 3.
Cue 3 Graphic Layer 1 Intensity to full, Graphic layer 2 intensity to 0 time 3.

Fixtures 1 thru 3 appear to work normally. Having issues with the fourth fixture where rather than fading smoothly from layer to layer, going from layer 2 to layer 1 occurs with a snap out in Layer 2 and a fade in on layer 1. I've tried changing the time on the Intensity of Layer 2 only, to no avail. Any thoughts? I just ran through every parameter, and other than telling which figure should be which in the collage, everything for Fixtures 1 through 3 match the values for Fixtures 4, so shouldn't they all be behaving similarly?