I need to first ask this question: Is there a link to the STABLE version of GO? When someone clicks download, they are taken to the SF page and presented with the latest version of GO which, IMHO, is NOT the STABLE version.
That aside, I have installed 4.0.66 and while installing modules, under the "Settings" module, the following change is suggested:
s/With this module you can manage various settings of groupoffice and itm modules/With this module, you can manage the various settings of groupoffice and its modules/
Lastly, while logged in as Admin or any user I was able to rightlick on the displayed tabs, which promptly made the tab hidden! It is not quite obvious to a user how to restore this tab again. I therefore suggest that when a tab is rightclicked, as the user and get user's confirmation if they really want to hide that tab.