Here's another question - and thanks everyone for bearing with me. This one is less pressing than the issue I just posted. Some parts of my newly created drawing symbols disappear when I make a clip cube. I figured out that the Z heights/bases on the lines are at really odd and differing heights - even lines that were created at the same time. I can click Ignore Z in the Clip Cube to work around the problem, but it would be better to change those Z heights. (Though it's a mystery how they got them in the first place.) I think I understand the manual's instructions on Editing Symbols (though I'm a bit hesitant to muck with my newly and laboriously created symbols), but exploding them to do that will break the Text Attributes, right?
All in all, I may just leave them and make sure Ignore Z is checked.
All in all, I may just leave them and make sure Ignore Z is checked.