Solved! by MonkeyTrainer. See the answer in context.
fyi: i am working with corridor object off the palette. found out what it is. when i click on something off of the tool palette, the properties box is suppossed to automatically open; rightfully so, to edit the objects. mine doesnt open when i choose something off the palette. is there an (weird) option/toggle somewhere that will auto. open the prop. box?
After rereading your post and the attached error. I'm thinking that the something you're click on in the toolpalette is a subassembly or other item that has properties editable in the Properties palette. So you need to open your Properties window.
Or I'm being dense today. I don't know how to Lock a toolpalette so I can't say how to Unlock it. At this point my best guess is that you need to open your Properties Palette.
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