The table tag is different in v760, to add the cellspacing borders back you'd want to add the following to the "extras" section in the style editor for all styles that you want them to display:
Code
table{border-collapse:separate;border-spacing:1px;}

Then in your t_inner (under "General CSS Properties") you'll want to set the border color:
Code
border: 1px solid #000000;

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