Cannot reproduce.

Please check that everything is up to date, run this command that should return nothing:
$ pacman -Qs kde | grep 4.14.1

[xxx@xxx]$ dolphin
Object::connect: No such signal org::freedesktop::UPower::DeviceAdded(QString)
Object::connect: No such signal org::freedesktop::UPower::DeviceRemoved(QString)
dolphin(23986) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-excel.sheet.binary.macroEnabled.12"
dolphin(23986) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-excel.addin.macroEnabled.12"
dolphin(23986) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-powerpoint.slideshow.macroEnabled.12"
dolphin(23986) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-excel.sheet.macroEnabled.12"
dolphin(23986) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-powerpoint.presentation.macroEnabled.12"
dolphin(23986) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-word.template.macroEnabled.12"
dolphin(23986) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-excel.template.macroEnabled.12"
dolphin(23986) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-powerpoint.template.macroEnabled.12"
dolphin(23986) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-word.document.macroEnabled.12"
dolphin(23986) KMimeTypeRepository::parents: "/usr/share/mime/subclasses" refers to unknown mimetype "application/vnd.ms-powerpoint.slide.macroEnabled.12"
dolphin(23986) KSambaSharePrivate::findSmbConf: KSambaShare: Could not find smb.conf!
dolphin(23986)/kdecore (services) KServicePrivate::init: The desktop entry file "/home/xxx/.directory" has Type= "Application" but no Exec line

KCrash: Application 'dolphin' crashing...
KCrash: Attempting to start /usr/lib/kde4/libexec/drkonqi from kdeinit
KCrash: Connect sock_file=/home/xxx/.kde4/socket-xxx-dev/kdeinit4__0
[xxx@xxx]$ pacman -Qs kde | grep 4.14.1
[xxx@xxx]$

This doesn't help. Please paste the backtrace provided by KCrash.

Application: Dolphin (dolphin), signal: Bus error
[Current thread is 1 (process 24564)]

Thread 1 (process 24564):
#0 0x00007f50c9aec79d in ?? ()
#1 0x0000000000000000 in ?? ()

Application: dolphin (4.14.2)
KDE Platform Version: 4.14.2
Qt Version: 4.8.6
Operating System: Linux 3.16.4-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

Do not know if it will be sufficient.

Nope. It doesn't.

Which packages did you install from AUR? (pacman -Qm)
Did you add any non-official repository?

Repos non-oficial I haven't.

pacman -Qm
chromium-pepper-flash 1:15.0.0.152-1
ctemplate 2.3-1
libgcrypt15 1.5.4-3
libiodbc 3.52.9-1
mysql-connector-c++ 1.1.3-2
mysql-workbench 6.2.3-4
spotify 0.9.11.27-1
swig2 2.0.12-3
ttf-ms-fonts 2.0-10
vsqlite++ 0.3.13-2


pacman -Qe | grep kde
kde-l10n-es 4.14.2-1
kde-meta-kdeadmin 4.13-3
kde-meta-kdeartwork 4.13-3
kde-meta-kdebase 4.13-3
kde-meta-kdegraphics 4.13-3
kde-meta-kdemultimedia 4.13-3
kde-meta-kdenetwork 4.13-3
kde-meta-kdeplasma-addons 4.13-3
kde-meta-kdesdk 4.13-3
kde-meta-kdeutils 4.13-3
kde-meta-kdewebdev 4.13-3
kdeplasma-applets-plasma-nm 0.9.3.4-4
kdesvn 1.6.0-3

I still don't get the issue.

Could you try with a new user?

Sorry, with other user yes work. Is not a bug.

I can't reproduce the bug