Rawstudio crashes on "quick export"

There are two save options. "Export As" works fine,
"Quick Export" causes Rawstudio to crash. Using CANON
raw format and exporting as JPEG after some minor image
tweaks.

Might be related to bug 76517

Ubuntu release 12.04

Package version 2.0-1ubuntu1

Here's the stack trace

--- stack trace ---
#0 0x007ce416 in __kernel_vsyscall ()
No symbol table info available.
#1 0x010191ef in raise () from /lib/i386-linux-gnu/libc.so.6
No symbol table info available.
#2 0x0101c835 in abort () from /lib/i386-linux-gnu/libc.so.6
No symbol table info available.
#3 0x009c3b9e in g_assertion_message () from /lib/i386-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#4 0x009c419f in g_assertion_message_expr () from /lib/i386-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#5 0x0091cb04 in rs_output_get_extension () from /usr/lib/librawstudio-2.0.so.0
No symbol table info available.
#6 0x0805abc1 in ?? ()
No symbol table info available.
#7 0x00b4c1ec in g_cclosure_marshal_VOID__VOID () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#8 0x00b4a484 in g_closure_invoke () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#9 0x00b5c0d9 in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#10 0x00b642dc in g_signal_emit_valist () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#11 0x00b64453 in g_signal_emit () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#12 0x0016dda6 in ?? () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
No symbol table info available.
#13 0x0016e7ed in gtk_action_activate () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
No symbol table info available.
#14 0x00b4c1ec in g_cclosure_marshal_VOID__VOID () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#15 0x00b492fd in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#16 0x00b4a484 in g_closure_invoke () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#17 0x00b5c535 in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#18 0x00b642dc in g_signal_emit_valist () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#19 0x00b64453 in g_signal_emit () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#20 0x00381395 in gtk_widget_activate () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
No symbol table info available.
#21 0x0025e667 in gtk_menu_shell_activate_item () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
No symbol table info available.
#22 0x0025ea71 in ?? () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
No symbol table info available.
#23 0x00251cad in ?? () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
No symbol table info available.
#24 0x002488a2 in ?? () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
No symbol table info available.
#25 0x00b492fd in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#26 0x00b4a484 in g_closure_invoke () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#27 0x00b5c70d in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#28 0x00b63ff5 in g_signal_emit_valist () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#29 0x00b64453 in g_signal_emit () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
No symbol table info available.
#30 0x00382413 in ?? () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
No symbol table info available.
#31 0x00246a6e in gtk_propagate_event () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
No symbol table info available.
#32 0x00246e00 in gtk_main_do_event () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
No symbol table info available.
#33 0x005cf758 in ?? () from /usr/lib/i386-linux-gnu/libgdk-x11-2.0.so.0
No symbol table info available.
#34 0x009a1d86 in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#35 0x009a2125 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#36 0x009a256b in g_main_loop_run () from /lib/i386-linux-gnu/libglib-2.0.so.0
No symbol table info available.
#37 0x00245b8f in gtk_main () from /usr/lib/i386-linux-gnu/libgtk-x11-2.0.so.0
No symbol table info available.
#38 0x08063e38 in ?? ()
No symbol table info available.
#39 0x0805731b in ?? ()
No symbol table info available.
#40 0x010044d3 in __libc_start_main () from /lib/i386-linux-gnu/libc.so.6
No symbol table info available.
#41 0x08057385 in ?? ()
No symbol table info available.

Looks as if the code has hit an assertion but didn't see any clues as to what this might have been.