Source Four LED Series 2 Lustre--no color control (output only white)

We are using Series 2 Lustre LED Profiles. These units have previously worked normally in our venue.

We just installed a new Ion XE console (2.9.1) and a few of our Lustre units are not acting properly--we can dim the intensity but there is no color control--the output is only white.

We've been through the menus, ideally wanting to use Direct Mode, Incandescent dimming curve and Red Shift Enabled. Trying various other settings as well as personalities in the Ion have not worked. There are 8- and 10-channel personality options we've tried in the console but neither seems to work (note other fixtures in the theatre are working OK with these settings)

We tried punching through each individual DMX address within the fixture, and again only the intensity channel functions. According to the fixture, it is receiving full intensity on every channel (even when we know we are not sending such).

The data path is Ion > Unmanaged Network Switch > Unmanaged Network Switch > 2-Port Gateway > DMX to fixture.

Any suggestions are appreciated!

Thanks.

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