Version:           2.0 beta 2 (using KDE 4.1.2)
OS:                Linux
Installed from:    Ubuntu Packages

Krita crashes when opening larger images. Not even spectacular sizes, anything moderately large. Tried with a limited amount of images only. I cannot therefore give the threshold, but it happened at a 200 kB image. 
Have not tried with anything else but large jpg's. Opens small images in various formats, no problem. Backtrace:

(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[KCrash handler]
#5  0x00007f141593afd5 in raise () from /lib/libc.so.6
#6  0x00007f141593cb43 in abort () from /lib/libc.so.6
#7  0x00007f1414dc06b5 in qt_message_output () from /usr/lib/libQtCore.so.4
#8  0x00007f1414dc07fd in qFatal () from /usr/lib/libQtCore.so.4
#9  0x00007f13ea512376 in ?? () from /usr/lib/kde4/libkritajpegimport.so
#10 0x00007f13ea5127a8 in ?? () from /usr/lib/kde4/libkritajpegimport.so
#11 0x00007f13ea50da1e in ?? () from /usr/lib/kde4/libkritajpegimport.so
#12 0x00007f1415681bcf in KoFilterChain::ChainLink::invokeFilter ()
   from /usr/lib/libkomain.so.5
#13 0x00007f1415681dd9 in KoFilterChain::invokeChain ()
   from /usr/lib/libkomain.so.5
#14 0x00007f1415663618 in KoFilterManager::importDocument ()
   from /usr/lib/libkomain.so.5
#15 0x00007f141564c4de in KoDocument::openFile () from /usr/lib/libkomain.so.5
#16 0x00007f1413a9d048 in KParts::ReadOnlyPart::openUrl ()
   from /usr/lib/libkparts.so.4
#17 0x00007f14156495e3 in KoDocument::openUrl () from /usr/lib/libkomain.so.5
#18 0x00007f1415668740 in KoMainWindow::openDocumentInternal ()
   from /usr/lib/libkomain.so.5
#19 0x00007f141566f7e7 in KoMainWindow::openDocument ()
   from /usr/lib/libkomain.so.5
#20 0x00007f141566db8c in KoMainWindow::slotFileOpen ()
   from /usr/lib/libkomain.so.5
#21 0x00007f141567118a in KoMainWindow::qt_metacall ()
   from /usr/lib/libkomain.so.5
#22 0x00007f1414ec5134 in QMetaObject::activate ()
   from /usr/lib/libQtCore.so.4
#23 0x00007f14143ccf57 in QAction::triggered () from /usr/lib/libQtGui.so.4
#24 0x00007f14143cd720 in QAction::activate () from /usr/lib/libQtGui.so.4
#25 0x00007f141476615d in ?? () from /usr/lib/libQtGui.so.4
#26 0x00007f14131c41a1 in KMenu::mouseReleaseEvent ()
   from /usr/lib/libkdeui.so.5
#27 0x00007f1414425359 in QWidget::event () from /usr/lib/libQtGui.so.4
#28 0x00007f141476893b in QMenu::event () from /usr/lib/libQtGui.so.4
#29 0x00007f14143d2c3d in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#30 0x00007f14143db25a in QApplication::notify () from /usr/lib/libQtGui.so.4
#31 0x00007f1413104b8b in KApplication::notify () from /usr/lib/libkdeui.so.5
#32 0x00007f1414eb0d61 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#33 0x00007f14143da5f8 in QApplicationPrivate::sendMouseEvent ()
   from /usr/lib/libQtGui.so.4
#34 0x00007f141443edd4 in ?? () from /usr/lib/libQtGui.so.4
#35 0x00007f141443d637 in QApplication::x11ProcessEvent ()
   from /usr/lib/libQtGui.so.4
#36 0x00007f14144652f4 in ?? () from /usr/lib/libQtGui.so.4
#37 0x00007f1410902d3b in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#38 0x00007f141090650d in ?? () from /usr/lib/libglib-2.0.so.0
#39 0x00007f14109066cb in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#40 0x00007f1414ed915f in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#41 0x00007f1414464a9f in ?? () from /usr/lib/libQtGui.so.4
#42 0x00007f1414eaf682 in QEventLoop::processEvents ()
   from /usr/lib/libQtCore.so.4
#43 0x00007f1414eaf80d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#44 0x00007f1414eb1cbd in QCoreApplication::exec ()
   from /usr/lib/libQtCore.so.4
#45 0x00007f1415c7c347 in kdemain () from /usr/lib/libkdeinit4_krita.so
#46 0x00007f1415926466 in __libc_start_main () from /lib/libc.so.6
#47 0x0000000000400659 in _start ()
#0  0x00007f14159b0621 in nanosleep () from /lib/libc.so.6

hope it helps