If I had to guess then your CF card is not too happy:
/dev/ufs/pfsense0: FREE BLK COUNT(S) WRONG IN SUPERBLK (SALVAGED)
/dev/ufs/pfsense0: SUMMARY INFORMATION BAD (SALVAGED)
/dev/ufs/pfsense0: BLK(S) MISSING IN BIT MAPS (SALVAGED)
/dev/ufs/pfsense0: 15885 files, 873983 used, 2906045 free (2597 frags, 362931 blocks, 0.1% fragmentation)
/dev/ufs/cf: FILE SYSTEM CLEAN; SKIPPING CHECKS
/dev/ufs/cf: clean, 99618 free (42 frags, 12447 blocks, 0.0% fragmentation)
Warning: file_get_contents(/etc/version): failed to open stream: No such file or directory in /etc/inc/globals.inc on line 88
pfSense on the 'nanobsd' platform…
Try another one - they are pretty cheap - or run a thorough test on the current one on another machine and try again.