Ok,
Thanks to the arch maintainer of bilbo, I could have backtrace for it.
The weird thing is that this time I could add the blog without any problem.
No problem neither to download previous posts and see them in bilbo.
However, when it comes to submitting a new post on the blog, I had a crash, and the backtrace is here :
Application: Bilbo Blogger (bilbo), signal: Segmentation fault
[KCrash Handler]
#5 QString (this=0x7fff15e0ff00, other=@0x10) at /usr/include/QtCore/qstring.h:711
#6 0x00007ff2f05daf31 in KBlog::BlogPost::postId (this=<value optimized out>) at /home/hcooh/Applis/bilbo-blogger/src/bilbo/bilbokblog/blogpost.cpp:146
#7 0x00007ff2f05e5abb in KBlog::GDataPrivate::slotFetchPost (this=<value optimized out>, loader=0x2d5be30, feed=<value optimized out>, status=<value optimized out>)
at /home/hcooh/Applis/bilbo-blogger/src/bilbo/bilbokblog/gdata.cpp:781
#8 0x00007ff2f05e3364 in KBlog::GData::qt_metacall (this=<value optimized out>, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff15e10170)
at /home/hcooh/Applis/bilbo-blogger/src/build/bilbokblog/gdata.moc:133
#9 0x00007ff2eefbbdec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#10 0x00007ff2ea8f42f2 in Syndication::Loader::loadingComplete () from /usr/lib/libsyndication.so.4
#11 0x00007ff2ea8f539d in Syndication::Loader::slotRetrieverDone () from /usr/lib/libsyndication.so.4
#12 0x00007ff2ea8f57ed in Syndication::Loader::qt_metacall () from /usr/lib/libsyndication.so.4
#13 0x00007ff2eefbbdec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#14 0x00007ff2ea8f7823 in Syndication::DataRetriever::dataRetrieved () from /usr/lib/libsyndication.so.4
#15 0x00007ff2ea8f85df in Syndication::FileRetriever::slotResult () from /usr/lib/libsyndication.so.4
#16 0x00007ff2ea8f8763 in Syndication::FileRetriever::qt_metacall () from /usr/lib/libsyndication.so.4
#17 0x00007ff2eefbbdec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#18 0x00007ff2ef601722 in KJob::result () from /usr/lib/libkdecore.so.5
#19 0x00007ff2ef601a9f in KJob::emitResult () from /usr/lib/libkdecore.so.5
#20 0x00007ff2efce38c3 in KIO::SimpleJob::slotFinished () from /usr/lib/libkio.so.5
#21 0x00007ff2efce3d83 in KIO::TransferJob::slotFinished () from /usr/lib/libkio.so.5
#22 0x00007ff2efce2691 in KIO::TransferJob::qt_metacall () from /usr/lib/libkio.so.5
#23 0x00007ff2eefbbdec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#24 0x00007ff2efda4381 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#25 0x00007ff2efda0c33 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#26 0x00007ff2efd93a5d in KIO::Slave::gotInput () from /usr/lib/libkio.so.5
#27 0x00007ff2efd95b7c in KIO::Slave::qt_metacall () from /usr/lib/libkio.so.5
#28 0x00007ff2eefbbdec in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#29 0x00007ff2efcb0ae7 in KIO::ConnectionPrivate::dequeue () from /usr/lib/libkio.so.5
#30 0x00007ff2efcb0c0d in KIO::Connection::qt_metacall () from /usr/lib/libkio.so.5
#31 0x00007ff2eefb6109 in QObject::event () from /usr/lib/libQtCore.so.4
#32 0x00007ff2edcdc69c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#33 0x00007ff2edce396e in QApplication::notify () from /usr/lib/libQtGui.so.4
#34 0x00007ff2f17e38d6 in KApplication::notify () from /usr/lib/libkdeui.so.5
#35 0x00007ff2eefa6cec in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#36 0x00007ff2eefa78ca in QCoreApplicationPrivate::sendPostedEvents () from /usr/lib/libQtCore.so.4
#37 0x00007ff2eefcf543 in ?? () from /usr/lib/libQtCore.so.4
#38 0x00007ff2eb81edbe in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#39 0x00007ff2eb822568 in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#40 0x00007ff2eb822690 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#41 0x00007ff2eefcf1b6 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#42 0x00007ff2edd6f64e in ?? () from /usr/lib/libQtGui.so.4
#43 0x00007ff2eefa55f2 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#44 0x00007ff2eefa59c4 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#45 0x00007ff2eefa7b79 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#46 0x0000000000422130 in main (argc=<value optimized out>, argv=<value optimized out>) at /home/hcooh/Applis/bilbo-blogger/src/bilbo/bilbo/main.cpp:57
The blog post was sent correctly on the server...
If it can help developpers... (I reported a bug)