I don't want to paste an entire crash log here if it's not needed. I can't find anyone else reporting this issue... maybe it's time to format. :-/
Each time, the tread that crashes is identified as:
Thread 13 Crashed:: Dispatch queue: com.symantec.applicationcontrol
Thread 13 crashed with X86 Thread State (64-bit):
rax: 0x0000000000000000 rbx: 0x0000000107945000 rcx: 0x00000001079446f8 rdx: 0x0000000000000000
rdi: 0x0000000000005803 rsi: 0x0000000000000006 rbp: 0x0000000107944720 rsp: 0x00000001079446f8
r8: 0x0000000000000000 r9: 0x0000000000000000 r10: 0x000000000c000000 r11: 0x0000000000000206
r12: 0x0000000107944a00 r13: 0x00000000000001ff r14: 0x0000000000000006 r15: 0x0000000107944840
rip: 0x00007fff8778a866 rfl: 0x0000000000000206 cr2: 0x0000000106afe000
Logical CPU: 0
Error Code: 0x02000148
Trap Number: 133
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Edit: I'm running OS X 10.9, Norton Internet Security 5.6 (10)