If you do not see a record for "Libraries" in the systemConfig.config this means that the module is not installed. We have RC2 release. Is this the version you used to upgrade your project to the RTM, because if you have used RC this might be the problem. Another reason could be permissions issue if you have set some restrictions to the backend pages from "Administration" >> "Backend pages".
The third reason here could be if you have missed to copy/merge the config files, because from your description it looks like the module works on one machine, but not on the other.
Please compare the config files and add "Libraries" config record.
the Telerik team