EAP-TLS/seg fault with 4096 bit keys

Hi again list, Another issue I have had in setting up a WPA2 Enterprise environment is that I can get it to work as expected with 2k keys, however, if I go to 4k keys, freeradius 1.1.4 loads properly but seg faults when handling a 4k key request. The environment is Apple Airport Extreme base station, and MacBook Pro client wth FreeRADIUS 1.1.4 under FreeBSD 5-STABLE. As soon as I migrate back to 2k keys it again works as expected. Can anybody make any suggestions on how to debug this? cheers, James