This started happening to me today.

** As a workaround, I can open kdevelop with sudo **

so I guess the problem has something to do with sessions.

stdout:
kdevelop
WARNING: deleting stale lockfile 
/home/bruno/.kdevduchain/{5bb877a5-d8b2-4cdc-b694-6c9b8bf67781}/1/lock
kdevelop(10968)/kdevplatform (language) KDevelop::ItemRepositoryRegistry::open: 
version-hint not found, seems to be an old version 
kdevelop(10968)/kdevplatform (language) KDevelop::ItemRepositoryRegistry::open: 
"The data-repository at 
/home/bruno/.kdevduchain/{5bb877a5-d8b2-4cdc-b694-6c9b8bf67781}/1 has to be 
cleared." 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action 
"F&ull Screen Mode" under id 85 
kdevelop(10968)/kdecore (KLibrary) findLibraryInternal: plugins should not have 
a 'lib' prefix: "libkonsolepart.so"
qrc:/main.qml:23:1: QML QDeclarativeRectangle_QML_0: Binding loop detected for 
property "areaName"
static bool QDeclarativeMetaType::isModule(const QByteArray&, int, int) Qt 4.7 
import detected; please note that Qt 4.7 is directly reusable as QtQuick 1.x 
with no code changes. Continuing, but startup time will be slower. 
QDeclarativeComponent(0x495eaf0)
QDeclarativeComponent(0x495eaf0)
kdevelop(10968)/kdevplatform (shell) 
KDevelop::SessionControllerPrivate::performRecovery: Starting recovery from  
"/home/bruno/.kde/share/apps/kdevelop/sessions/{5bb877a5-d8b2-4cdc-b694-6c9b8bf67781}/recovery/current"
 
The program 'kdevelop' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadWindow (invalid Window parameter)'.
  (Details: serial 2811 error_code 3 request_code 20 minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
kdevelop(10968)/konsole Konsole::SessionManager::~SessionManager: Konsole 
SessionManager destroyed with sessions still alive 
pp_macro::definition There were items left on destruction: 236
register count: 0, destroy count 0: 

kdevelop -version
Qt: 4.8.4
KDE Development Platform: 4.10.4
KDevelop: 4.4.1

Running on ubuntu 13.04

Tried the following and none solved the issue
  kdevelop -n testsession
  kdevelop --geometry 200x200+0+0
  kdevelop --graphicssystem raster
  kdevelop --graphicssystem opengl
  kdevelop --geometry 900x900+0+0
  kdevelop --geometry 900x900+0+0 --graphicssystem raster
  kdevelop --geometry 900x900+0+0 --graphicssystem opengl
  mv ~/.kde/share/apps/kdevelop/ ~/.kde/share/apps/kdevelop.bak

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Bugs, which is subscribed to kdevelop in Ubuntu.
https://bugs.launchpad.net/bugs/1178843

Title:
  kdevelop won't start

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