When looking the browser developer tools, it looks that those few working BO parts has "...index.php?controller=...." in url, and those that load properly look like this:
..../index.php?controller=AdminAttributesGroups&token=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
..../index.php?controller=AdminOrders&token=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
and all those BO parts that fails and just show empty page, are missing it, also otherwise the url structure looks different ??? Like all the failing BO parts look like this:
..../index.php/sell/catalog/products?_token=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
..../index.php/sell/catalog/categories?_token=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
..../index.php/configure/advanced/system-information/?_token=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Has there been some change on this between 1.7.5.2 -> 1.7.6 ?