I've noticed my computer hanging for a couple seconds, and it seems to be related to segfaults from DDDT. I get these messages in syslog

Jan 25 10:48:23 Conroe-linux kernel: [ 134.397272] wcg_dddt_autodo[6655]: segfault at ff3fbff4 rip 8132bd0 rsp ff3fbed0 error 6
Jan 25 10:52:15 Conroe-linux kernel: [ 322.466315] wcg_dddt_autodo[7078]: segfault at ff3fbff4 rip 8132bd0 rsp ff3fbed0 error 6
Jan 25 10:52:15 Conroe-linux kernel: [ 322.666237] wcg_dddt_autodo[7097]: segfault at ff5fbff4 rip 8132bd0 rsp ff5fbed0 error 6

Let me know if you need some more information. I'm running BOINC 6.4.5, on Ubuntu 8.10 with the 2.6.24-21-generic kernel