[Solved]Xfce Thunar logouts opening my symlinked ~/Downloads

[Lemongrass]

Hi there! First of all: I like the system that Debian developers made, Debian is really good.

I've found a problem: when I open my ~/Downloads symbolic link that opens my actual Downloads folder in /mnt/adatok/downloads_2 and if this folder contains a video file (either *.mp4 or *.mp3, I can't recall it now, but I can reproduce the issue and find out if someone wants that), I get logged out, and I need to log back in. Does somebody know why is this?

Additional info:

I created my ~/Downloads like this:

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rm -rf ~/Downloads
ln -s /mnt/adatok/downloads_2 ~/Downloads

software info:

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$ dpkg -l | grep thunar
ii  libthunarx-2-0                        1.6.3-2                              amd64        extension library for thunar
ii  thunar                                1.6.3-2                              amd64        File Manager for Xfce
ii  thunar-archive-plugin                 0.3.1-3                              amd64        Archive plugin for Thunar file manager
ii  thunar-data                           1.6.3-2                              all          Provides thunar documentation, icons and translations
ii  thunar-media-tags-plugin              0.2.1-1                              amd64        Media tags plugin for Thunar file manager
ii  thunar-volman                         0.8.0-4                              amd64        Thunar extension for volumes management

as VLC is the default video program in Thunar:

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ii  libvlc5                               2.2.4-1~deb8u1                       amd64        multimedia player and streamer library
ii  libvlccore8                           2.2.4-1~deb8u1                       amd64        base library for VLC and its modules
ii  phonon-backend-vlc:amd64              0.8.0-2                              amd64        Phonon VLC backend
ii  vlc                                   2.2.4-1~deb8u1                       amd64        multimedia player and streamer
ii  vlc-data                              2.2.4-1~deb8u1                       all          Common data for VLC
ii  vlc-nox                               2.2.4-1~deb8u1                       amd64        multimedia player and streamer (without X support)
ii  vlc-plugin-notify                     2.2.4-1~deb8u1                       amd64        LibNotify plugin for VLC
ii  vlc-plugin-pulse                      2.2.4-1~deb8u1                       all          transitional dummy package for vlc
ii  vlc-plugin-samba                      2.2.4-1~deb8u1                       amd64        Samba plugin for VLC

My /etc/fstab:

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# /etc/fstab: static file system information.
#
# <file system> <mount point>   <type>  <options>       <dump>  <pass>

#Entry for /dev/sda3 :
UUID=90b21bb5-2b76-498c-8ee8-6670c8a9230b	/	ext4	errors=remount-ro	0	1
#Entry for /dev/sda5 :
UUID=aa0b28bb-bed1-4ff0-8987-f089ce843704	/mnt/adatok	ext4	defaults	0	0
#Entry for /dev/sda6 :
UUID=abec6a32-1925-4f02-a42e-7086f67bb4a9	none	swap	sw	0	0
/dev/sr0	/media/cdrom0	udf,iso9660	user,noauto	0	0

Finally, my basic system info (Debian 8.7.1 Xfce):

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$ inxi -Fxz
System:    Host: Lemongrass-pc Kernel: 3.16.0-4-amd64 x86_64 (64 bit gcc: 4.8.4) 
           Desktop: N/A Distro: Debian GNU/Linux 8 
Machine:   System: Dell product: Inspiron 5558 v: 01
           Mobo: Dell model: 0WMF3P v: A00 Bios: Dell v: A13 date: 09/06/2016
CPU:       Dual core Intel Core i5-5200U (-HT-MCP-) cache: 3072 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 8779 
           Clock Speeds: 1: 2477 MHz 2: 1978 MHz 3: 2329 MHz 4: 2349 MHz
Graphics:  Card-1: Intel Broadwell-U Integrated Graphics bus-ID: 00:02.0
           Card-2: NVIDIA Device 1299 bus-ID: 08:00.0
           Display Server: X.Org 1.16.4 drivers: intel (unloaded: fbdev,vesa)
           Resolution: 1366x768@60.00hz
           GLX Renderer: Gallium 0.4 on llvmpipe (LLVM 3.5, 256 bits)
           GLX Version: 3.0 Mesa 10.3.2 Direct Rendering: Yes
Audio:     Card-1 Intel Wildcat Point-LP High Definition Audio Controller 
           driver: snd_hda_intel bus-ID: 00:1b.0 
           Card-2 Intel Broadwell-U Audio Controller 
           driver: snd_hda_intel bus-ID: 00:03.0 
           Sound: Advanced Linux Sound Architecture v: k3.16.0-4-amd64
Network:   Card-1: Realtek RTL8101E/RTL8102E PCI Express Fast Ethernet controller
           driver: r8169 v: 2.3LK-NAPI port: e000 bus-ID: 07:00.0
           IF: eth0 state: down mac: <filter>
           Card-2: Intel Wireless 3160
           driver: iwlwifi v: in-tree: bus-ID: 06:00.0
           IF: wlan0 state: up mac: <filter>
Drives:    HDD Total Size: 500.1GB (58.4% used)
           ID-1: /dev/sda model: WDC_WD5000LPVX size: 500.1GB temp: 36C
Partition: ID-1: / size: 29G used: 7.7G (29%) fs: ext4 dev: /dev/sda3 
           ID-2: swap-1 size: 10.48GB used: 0.00GB (0%) fs: swap dev: /dev/sda6 
Sensors:   System Temperatures: cpu: 25.0C mobo: N/A 
           Fan Speeds (in rpm): cpu: N/A 
Info:      Processes: 172 Uptime: 2:32 Memory: 893.7/7914.4MB 
           Init: systemd runlevel: 5 Gcc sys: 4.9.2 
           Client: Shell (bash 4.3.301) inxi: 2.1.28 

It's not a great bug, as I've seen if I move the *.mp3 or *.mp4 to another location, this doesn't happen. Thanks in advance for every thought!
This doesn't seem to crash anything else than Thunar. Terminal and mc can handle it.

[debiman]

try disabling thubmnails completely (thunar preferences).

does that fix the issue?

if it does, it will give us a good hint as to what's going on, and maybe we can find a way to fix the underlying issue and later re-enable thumbnails.

[Lemongrass]

Thank you, debiman, this fixed my issue!
I've tried it with a file that has recently crashed Thunar.