I don't know if I can help you or not, but I had a similar problem. With the following set:

$bGblCustomersAlsoPurchased = true;
$bGblCrossSell_Tab = true;
I got NEITHER actually showing up on those tabs.

Since I am only using the crosssell contrib, and not needing Customers Also Purchased products, I set:

$bGblCustomersAlsoPurchased = false;

and then my crosssell products showed up on the We Also Recommend tab.

I don't know if this is a tabbed products bug or what, but since I don't need both tabs, what I did worked for me.

Try disabling one, then the other, and see what you get. Let us know what happens.