If you use Tables in Dreamweaver then chances are you have run into a problem and had a difficult time navigating around complicated table structure.
Here is an easy way to “enlarge” the viewing distance around all the table sets. Under the View menu, scroll down to Table Mode, then over to Expanded Tables Mode or F6 (for Dreamweaver CS4; opt + F6).
This will really help to see exactly where the problem is by giving a nice space around all the tables in your layout. It will look a little odd at first because it is not a clean and true WYSIWYG version of your web page but a more of a visual aid.
I generally work in the Standard Mode and only go into the Expanded Tables Mode when a problem arises.
You can toggle between Expanded Tables Mode and the Standard Mode by typing the F6 key (for Dreamweaver CS4-CS6; opt + F6).