If you created a table with no border, the table is no show in your page. So how to show the hidden table, below is the step.
1) Log into the RV SiteBuilder
2) Select Step 5
3) Select the WYSIWYG on the page
4) Click on the hidden table
5) Click on the Show/Hide Hidden Elements button
6) Table will show up in your edit page but not in your web page after you save it.