FWIW, I had this problem with some existing barrier devices that were placed prior to the 32.00 update. Even though the Barrier Material was set to None, the diagonal red lined material was showing up in gameplay. I was able to fix it by setting a barrier material (to any available material), and then clearing it again. Version 32.00 must have had the material set as a default that wasn’t showing up in the Barrier Material editor field for older barrier devices.
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