Description of problem:
Copying a 5.2GB file from a USB stick (EXT3 formatted) to a local directory.

Version-Release number of selected component:
Thunar-1.6.4-1.fc20

Additional info:
reporter:       libreport-2.2.3
backtrace_rating: 4
cmdline:        /usr/bin/thunar
crash_function: g_type_check_instance_is_a
executable:     /usr/bin/thunar
kernel:         3.17.8-200.fc20.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (10 frames)
 #0 g_type_check_instance_is_a at gtype.c:3975
 #1 g_param_value_set_default at gparam.c:607
 #2 thunar_preferences_get_property at thunar-preferences.c:808
 #3 object_get_property at gobject.c:1303
 #4 g_object_get_valist at gobject.c:2193
 #5 g_object_get at gobject.c:2283
 #6 thunar_transfer_job_veryify_destination at thunar-transfer-job.c:690
 #7 thunar_transfer_job_execute at thunar-transfer-job.c:957
 #8 exo_job_scheduler_job_func at exo-job.c:317
 #9 io_job_thread at gioscheduler.c:89