It appears as if writing or reading from any variable starting with "LWPN" or "EWPN" crashes ZC in build 240 and all builds lower, although it parses just fine. I haven't tried all of them, but I did try the following, all crashed ZC the second they tried to run:
LWPNDIR
LWPNID
LWPNX
LWPNY
LWPNZ
LWPNJUMP
LWPNANGULAR
LWPNDEAD
EWPNDIR
EWPNID
EWPNX
EWPNY