Version:            (using Devel)
Installed from:    Compiled sources
Compiler:          gcc version 4.2.3 (Gentoo 4.2.3 p1.0)
 
OS:                Linux

from todays SVN (initial checkout) I wanted to test out new kwin effects/features.

however, when chaning just pixmap filter to "nearest (fastest)", and pressing apply in the end, kwin crashed me away:

Application: KWin (kwin), signal SIGABRT
 [?1034h(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0x2b7d3a200240 (LWP 14510)]
[New Thread 0x40804950 (LWP 14513)]
[KCrash handler]
#5  0x00002b7d37eab185 in raise () from /lib64/libc.so.6
#6  0x00002b7d37eac630 in abort () from /lib64/libc.so.6
#7  0x00002b7d37ea477f in __assert_fail () from /lib64/libc.so.6
#8  0x00002b7d322d30cd in KWin::SceneOpenGL::paint (this=0x733e10, 
    damage=@0x7fff78a88130, toplevels=@0x7fff78a88120)
    at /home/cparpart/projects/kde/kdebase/workspace/kwin/scene_opengl.cpp:603
#9  0x00002b7d322c38de in KWin::Workspace::performCompositing (this=0x686850)
    at /home/cparpart/projects/kde/kdebase/workspace/kwin/composite.cpp:326
#10 0x00002b7d3226166f in KWin::Workspace::qt_metacall (this=0x686850, 
    _c=QMetaObject::InvokeMetaMethod, _id=136, _a=0x7fff78a88250)
    at /home/cparpart/build/kde/kdebase/workspace/kwin/workspace.moc:430
#11 0x00002b7d3437704d in QMetaObject::activate (sender=0x686c48, 
    from_signal_index=4, to_signal_index=4, argv=0x0)
    at kernel/qobject.cpp:3010
#12 0x00002b7d343775d3 in QMetaObject::activate (sender=0x686c48, 
    m=0x2b7d34683240, local_signal_index=0, argv=0x0)
    at kernel/qobject.cpp:3080
#13 0x00002b7d343c0b28 in QTimer::timeout (this=0x686c48)
    at .moc/debug-shared/moc_qtimer.cpp:126
#14 0x00002b7d3438247c in QTimer::timerEvent (this=0x686c48, e=0x7fff78a88c00)
    at kernel/qtimer.cpp:263
#15 0x00002b7d34374bc0 in QObject::event (this=0x686c48, e=0x7fff78a88c00)
    at kernel/qobject.cpp:1105
#16 0x00002b7d35569b83 in QApplicationPrivate::notify_helper (this=0x612b00, 
    receiver=0x686c48, e=0x7fff78a88c00) at kernel/qapplication.cpp:3766
#17 0x00002b7d35569ea5 in QApplication::notify (this=0x7fff78a89000, 
    receiver=0x686c48, e=0x7fff78a88c00) at kernel/qapplication.cpp:3360
#18 0x00002b7d36913070 in KApplication::notify (this=0x7fff78a89000, 
    receiver=0x686c48, event=0x7fff78a88c00)
    at /home/cparpart/projects/kde/kdelibs/kdeui/kernel/kapplication.cpp:311
#19 0x00002b7d3227ebb9 in KWin::Application::notify (this=0x7fff78a89000, 
    o=0x686c48, e=0x7fff78a88c00)
    at /home/cparpart/projects/kde/kdebase/workspace/kwin/main.cpp:368
#20 0x00002b7d3435ee9c in QCoreApplication::notifyInternal (
    this=0x7fff78a89000, receiver=0x686c48, event=0x7fff78a88c00)
    at kernel/qcoreapplication.cpp:587
#21 0x00002b7d343635af in QCoreApplication::sendEvent (receiver=0x686c48, 
    event=0x7fff78a88c00)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#22 0x00002b7d343977bd in QTimerInfoList::activateTimers (this=0x616410)
    at kernel/qeventdispatcher_unix.cpp:563
#23 0x00002b7d34394dff in timerSourceDispatch (source=0x6163b0)
    at kernel/qeventdispatcher_glib.cpp:166
#24 0x00002b7d38efb551 in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#25 0x00002b7d38efbd55 in ?? () from /usr/lib/libglib-2.0.so.0
#26 0x00002b7d38efc1fc in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#27 0x00002b7d34393ea0 in QEventDispatcherGlib::processEvents (this=0x612f30, 
    flags=@0x7fff78a88e40) at kernel/qeventdispatcher_glib.cpp:325
#28 0x00002b7d35620d53 in QGuiEventDispatcherGlib::processEvents (
    this=0x612f30, flags=@0x7fff78a88ea0)
    at kernel/qguieventdispatcher_glib.cpp:204
#29 0x00002b7d3435b8b4 in QEventLoop::processEvents (this=0x7fff78a88f50, 
    flags=@0x7fff78a88f00) at kernel/qeventloop.cpp:149
#30 0x00002b7d3435bab0 in QEventLoop::exec (this=0x7fff78a88f50, 
    flags=@0x7fff78a88f60) at kernel/qeventloop.cpp:200
#31 0x00002b7d3435f89f in QCoreApplication::exec ()
    at kernel/qcoreapplication.cpp:845
#32 0x00002b7d355698e4 in QApplication::exec () at kernel/qapplication.cpp:3298
#33 0x00002b7d32280242 in kdemain (argc=2, argv=0x7fff78a894d8)
    at /home/cparpart/projects/kde/kdebase/workspace/kwin/main.cpp:510
#34 0x0000000000400983 in ?? ()
#35 0x00007fff78a894d8 in ?? ()
#36 0x0000000200000000 in ?? ()
#37 0x0000000000000000 in ?? ()
#0  0x00002b7d37f11c21 in nanosleep () from /lib64/libc.so.6