Make sure your /var/log partition is not full with df -h as that will halt cpview history logging.
Next try restarting the cpview services like this:
cpview -s off
cpview -s on
If still having the problem, there may be some corruption in the cpview history database file here: $CPDIR/log/cpview_services/*
If you can turn cpview services off, back up all files in this directory, remove them, then restart cpview services.
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