I did an install and only included the blogs and photos modules. Anyway I was fiddling in the page builder with the "Homepage" page. Believe it or not I managed too mess up with only two modules present. So I decided to reset (Reset Page Button). After the page had reset it put a few extra blocks, on the active blocks section, which were not originally there on after the default install of D7. For instance it included a forums block which was not originally there. Also it seemed to have messed up the titles of some of the blocks by adding underscores (_) at the beginning of the titles. For good measure, it also seemed excluded some of the blocks, that were originally there. For instance, after the default installation and inclusion of my two modules, I noticed that there was a categories block in the homepage (which is GREAT!) however it has disappeared after clicking on "Reset Page" :-(