This is a known bug that is fixed in 5.1_MP5 or you can open a call with symantec and request a new bpcoverage binary. Thats what I did. I downloaded the binary and was then good to go.
BUG REPORT: When using certain versions of VERITAS NetBackup (tm), running the "check_coverage" script or the "bpcoverage" command may result in a core dump. http://seer.support.veritas.com/docs/281411.htm