Libraries are not displayed

Of the 30 libraries that I have installed and that are also displayed in the Library Manager, four are not displayed in the MediaBay (project window on the right-hand side):
HALion:
Sonic Factory Content (installed in 2013)
Sonic Selection SE2*
Groove Agent
GA Factory Content
GA One (installed 2008, maybe it is outdated and therefore skipped)
*Halion Sonic Selection SE2 is neither displayed in the MediaBay nor in the Library Manager. Only Sonic Selection is displayed in both.

Does anyone have a tip?