Ive got a strange error with then new rc1 version of Nagios 3

check_ping returns the error:

CRITICAL - Could not interpret output from ping command

and sets the monitor to down

unyet running the check_ping from the command line

ie:

/usr/local/nagios/libexec/check_ping -H 127.0.0.1-w 100.0,20% -c 500.0,60% -p 5

works fine and returns ledgible responses

anyone have any idea whats causing this and how to fix it?