I can confirm the problem still exists using r24310.
********************
ERROR: Negative TU costs while walking
********************
Shutdown server: Server crashed.
==== ShutdownGame ====
./ufo[0x55a9e5]
./ufo[0x55aa45]
/lib/libc.so.6[0x7ff97e2390a0]
./ufo[0x439647]
./ufo(HUD_ActorUpdateCvars+0x5c)[0x43bbff]
./ufo(CL_SlowFrame+0x19)[0x44f1a9]
./ufo[0x50151f]
./ufo(Qcommon_Frame+0x95)[0x50181b]
./ufo(main+0x57)[0x559695]
/lib/libc.so.6(__libc_start_main+0xe6)[0x7ff97e224466]
./ufo[0x427aa9]
Error: Received signal 11.
