Does the user who you are trying to view the man pages with have a low limit set on the amount of allowed open files? Usually set with ulimit, 'ulimit -a' should list all the limits. How ever you usually can't change this limit. So you should probably be checking what kind of files are being held open. Maybe close a few programs if necessary. Are there any programs open which forget to close file descriptors? You can check all the used file descriptors with the command 'lsof'.
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