Model Coverage and cv.cvdatagroup question

We're running multiple tests, 20+, and we're collecting model coverage from each one of the tests. When we're done we load the .cvt files using cvload and using the second return parameter as input into cvhtml to get all the coverage. When this is don't we have a huge file that you have to scroll horizontally to get to the end to see what they full coverage is. This makes seeing what the full coverage is and what the system in question hard.

So I seem that cvhtml could take in a cvdatagroup object so I put all of our tests into a cvdatagroup object and used that to generate our cvhtml document. When this HTML is generated it only shows one test like I wanted, but it only shows the coverage for the first object in the cvdatagroup object.

So I have a few questions, why does it only give me the coverage report for the first item in the data group when the data group has over 20 items in it, and how can I get this data group to give me the combined coverage together instead of doing each test individually and doing a combined one at the end?

This is on 2012b XP and Win7.

EDIT: Tests are saved using cvsave and covCumulativeData, which is a variable that's defined in the coverage settings results tab.