Update
Problem was related to updating Nvidia drivers from 355.11 to 361.16. After going back to 355.11, the SDK starts.

Original
Since yesterday I'm not able to start Ubuntu SDK on my Ubuntu 14.04. When I try to start it from Terminal I get this error:
michal@terabig:~$ ubuntu-sdk-ide
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "Podąż za symbolem pod kursorem" under id 173
/usr/bin/ubuntu-sdk-ide: line 6: 15453 Naruszenie ochrony pamięci (core dumped) $BINDIR/qtcreator -platformtheme appmenu-qt5 ${1+"$@"}
michal@terabig:~$

"Podąż za symbolem pod kursorem" in English would be "Follow the symbol under the cursor" and Naruszenie ochrony pamięci means Segfault

Any help much appreciated. Thanks!