I posted the following message, but I should clarify that I am on AutoCad LT for Mac - no flatten tool, etc.

I made the mistake of importing an engineer's survey into my drawing. I am having trouble now with many of the lines that I draw being non-coplanar. Is there any way to fix this?

I created a block with the "bad" drawings and imported it into a new file, thinking that this would freeze the problem somehow. But my new drawing in this file is also giving me non-coplanar lines.

Thanks.