Some objects turned black. I cannot change back to default color

Technical Problems SketchUp
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Some objects turned black. I cannot change back to the default color, but can paint with a different color.
I can revert to an older copy of the file and it works fine. I have checked everything I can think of, Style settings etc. and cannot fix this issue. I am trying to complete a job and this is very frustrating.

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This puzzles me. Have you checked the color of faces inside the objects, they need to be default so the object instances show their “object” color,
Did you explode objects and later on regrouped their geometry?
Please upload the model.skp for us to see what is going on.

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@Wo3Dan Thank you so much for responding. The file is too large to upload. (35,000 KB). I cut and pasted the offending models (3 simple buildings on a site plan) to a clean file and they no longer exhibited the problem.
The rest of the site plan is fine. (terrain, utilities, boundaries, other small structures such as water tanks, septic tank, as well as the main building model. I think I can revert to a backup file to solve this issue, but can only hope it doesn’t reoccur. Some older posts suggest that I may need to upgrade my graphics card, but I have not had issues before. I have been using SU Pro for 4 years. To reiterate, three simple building shaped models in my site plan turned all black and cannot be changed back to default colors, but may be painted with other colors or textures. Other elements in the site plan are not affected.
T.

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@Wo3Dan I should add that when I deleted the models and replaced them with fresh copies they once again appeared black.

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Upload it to a file sharing site and provide a link to it here. Be sure to make it shareable so we can read it.

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Okay, I exploded one of the objects, a small pumphouse, 4 walls and a roof, and when I regrouped and edited, it reverted automatically to the default colour. After that, I went into the entity info dialogue box and was able to manually change the color of the other building model from black to default. This time it worked. I’m not really sure what I did, but thanks for the tip about exploding the geometry and then regrouping.
Your input was a great help.

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Thanks, but the problem is solved for now. I will try a file sharing site next time I have such an issue. I would like to know what happened, so next time I may save a copy before trying to fix it, then other more computer saavy people could examine the files.

Thank you for offering though.

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