To get mismatched divs to line up

When the div's just won't line up and Dreamweaver isn't giving the yellow highlight clue:
In Dreamweaver:
- click the left menu "format source code" (the "paintcan" icon)
- click "code format settings"
- set the indent to 10 spaces or so and click ok.
- "format source code"
The indents are now so wide, incorrect indents should be obvious.