Description of problem:
Had eclipse running

open Thunar 1.6.4 
browse to /home/brian/workspace
select current project 
right click copy
browse to /home/brian/backup rightclick paste
App closes window (dissapears----)

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 --daemon
crash_function: g_cancellable_is_cancelled
executable:     /usr/bin/thunar
kernel:         3.17.8-200.fc20.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (9 frames)
 #0 g_cancellable_is_cancelled at gcancellable.c:292
 #1 g_cancellable_set_error_if_cancelled at gcancellable.c:309
 #2 g_file_query_info at gfile.c:1195
 #3 thunar_transfer_job_veryify_destination at thunar-transfer-job.c:718
 #4 thunar_transfer_job_execute at thunar-transfer-job.c:957
 #5 exo_job_scheduler_job_func at exo-job.c:317
 #6 io_job_thread at gioscheduler.c:89
 #7 g_task_thread_pool_thread at gtask.c:1245
 #9 g_thread_proxy at gthread.c:798