Umm... I bet I know what your issue is. After you generate and import (using the open) function in CC, click "Reset View" I bet your DXF is huge and you don't see it in your work area. I had my wife export some vector-graphics files I was going to carve and when CC opened them, they were like 1600 inches tall, so on my 8x8" workspace, I didn't even see it.
This is probably your issue. Try it, if it doesn't work let me know and I'll rack my brain to see if there's another answer.
I've kinda been pushing librecad for a lot of people, it's a great-way to check your DXF before you import it in carbide create, and allows you to do some of the advanced things that may solve problems that are simply not solvable in CC, such as exploding blocks.
At the moment, all I've been using carbide create for is generating toolpaths, and it does this generally pretty well. I don't consider it a very good design option at the moment.