Exiting workmode crashing

[changrilla]

Hi. Not been on for a while but am experiencing crashes with a particular model. I've scrutinized it and can't find anything wrong. Exported to stl and viewed in FreeCad which usually shows up any odd artifacts, even had it printed without any problems but can't switch workmode off. I'm using 1.5.4 but have tried it on 2.1.5 with the same problem.

Hopefully someone can help

tia Gordon

File: http://www.mgcsoft.com/junk/LatchPin_k_tmp.wings

Start of dump:

=erl_crash_dump:0.3
Fri Aug 31 10:41:40 2018
Slogan: binary_alloc: Cannot reallocate 718368715 bytes of memory (of type "binary").
System version: Erlang/OTP 18 [erts-7.0.1] [source-7dfcf74] [smp:2:2] [async-threads:10]
Compiled: Fri Jul 3 08:14:29 2015
Taints:
Atoms: 15737
Calling Thread: scheduler:1
=scheduler:1
Scheduler Sleep Info Flags:
Scheduler Sleep Info Aux Work:
Current Port:
Run Queue Max Length: 0
Run Queue High Length: 0
Run Queue Normal Length: 0
Run Queue Low Length: 0
Run Queue Port Length: 0
Run Queue Flags: NONEMPTY
Current Process: <0.30.0>
Current Process State: Running
Current Process Internal State: ACT_PRIO_NORMAL | USR_PRIO_NORMAL | PRQ_PRIO_NORMAL | ACTIVE | RUNNING
Current Process Program counter: 0x0b5017a8 (wings_draw_setup:dup3/3 + 4)
Current Process CP: 0x0b4fe430 (wings_draw_setup:setup_smooth_normals/4 + 1016)
Current Process Limited Stack Trace:
0x05ee6b10:SReturn addr 0xB4FDFC8 (wings_draw_setup:setup_smooth_normals/1 + 38
0x05ee6b2c:SReturn addr 0xB467784 (wings_draw:update_fun_2/3 + 1480)
0x05ee6b38:SReturn addr 0xB466FF0 (wings_draw:update_fun/3 + 52)
0x05ee6b40:SReturn addr 0xB45FA64 (wings_dl:map_1/5 + 80)
0x05ee6b4c:SReturn addr 0xB464F3C (wings_draw:refresh_dlists/1 + 52)
0x05ee6b64:SReturn addr 0x4B1EBE8 (wings:main_loop/1 + 44)
0x05ee6b68:SReturn addr 0x552A660 (wings_wm:handle_event/3 + 112)
0x05ee6b70:SReturn addr 0x552A0DC (wings_wm:send_event/2 + 572)
0x05ee6b80:SReturn addr 0x5529760 (wings_wm:do_dispatch/2 + 12
0x05ee6bac:SReturn addr 0x55290C0 (wings_wm:get_and_dispatch/0 + 2
0x05ee6bb8:SReturn addr 0x4B1E06C (wings:init/1 + 88
0x05ee6bbc:SReturn addr 0x5AC76F04 (<terminate process normally>)