What does a RED selection box mean

The attached image shows a red selection box that has appeared instead of the usual blue one. I cannot edit or delete anything within this box. What does it mean and how can I manipulate it?

Hi Paul,

The color depends on the Style in use. However, I am going to say in this case the red means the Group or Component has been locked.

A Locked Group or Component can not be moved using the SketchUp’s tools. Locking is a way to ensure something can not be accidentally modified,

You can lock and unlock a Group or Component from the context (right-click) menu.

Note some extensions fail to honor the locking and may modifiy locked entities.

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