Using bbc1.9e-btf (not the most recent version as of this writing, but it matched the old system) generated this message in BBOUT:
Mon Apr 10 12:45:55 2006 bb-local.sh /bin/sort: open failed: +4: No such file or directory
The DISK status page showed:
red Mon Apr 10 11:25:35 EDT 2006 – Filesystem of /usr/local/bb/bbc1.9e-btf/tmp is FULL
Which at first didn’t seem related, but it went away when the issue was resolved.