ioquake 3 no enemies appear whatsoever

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I recently installed ioquake3 on a fresh install of CentOS 7 (64-bit) with all the *.pk3 files from the original game CD-ROM properly installed.
The game starts fine but no enemies appear in any of the arenas. The ioquake3 help site and even an all-out Google search have failed me here.
Can anyone please help me figure out how to fix this?
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