Material Test Generator creates a black box over squares

trying to generate a default material test - mac bigSur 11.7.10, lightburn 1.5.01 - and preview shows squares then complete black on top. i created a preset if that matters. tried an actual burn, and stopped it after confirming the text and fill were just turning into a black blob. Since I can’t get to any layer info, I don’t know or have options from here - something wrong in the material/text/border setting in default?
Please help…

Check this setting. It is probably set to fill.

yes, thank you - can you tell I’m just learning! I changed to LINE and black block is gone… but text not showing (that is set to FILL)

got it - set all to defaults, and get text - thank you!