Version:           0.10.0-rc2 (using KDE 4.2.0)
Compiler:          gcc (Gentoo 4.3.3 p1.0, pie-10.1.5) 4.3.3
 
OS:                Linux
Installed from:    Gentoo Packages

In my case, Digikam is unusable : When I click on a photo to view it, I get a crash after 2-3 seconds. Same thing when I try to modify it.
This problem may be due to Qt 4.5.0_rc1.

I hope followin backtrace is useful (else, you can close this bug report or ask me some tests) :

Thread 1 (Thread 0xb7acf920 (LWP 7639)):
[KCrash Handler]
#6  0xb7dcae88 in Digikam::ThumbBarItem::repaint (this=0x0) at /var/tmp/portage/media-gfx/digikam-0.10.0_rc2/work/digikam-0.10.0-rc2/libs/widgets/common/thumbbar.cpp:1179
#7  0x08288754 in Digikam::ImagePreviewBar::eventFilter (this=0x850b998, obj=0x854c120, ev=0xbf8bf418)
    at /var/tmp/portage/media-gfx/digikam-0.10.0_rc2/work/digikam-0.10.0-rc2/digikam/imagepreviewbar.cpp:695
#8  0x438ed59d in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib/qt4/libQtCore.so.4
#9  0x4403324e in QApplicationPrivate::notify_helper () from /usr/lib/qt4/libQtGui.so.4
#10 0x4403b582 in QApplication::notify () from /usr/lib/qt4/libQtGui.so.4
#11 0x4d1aec02 in KApplication::notify (this=<value optimized out>, receiver=) at /var/tmp/portage/kde-base/kdelibs-4.2.0-r3/work/kdelibs-4.2.0/kdeui/kernel/kapplication.cpp:307
#12 0x438ee22d in QCoreApplication::notifyInternal () from /usr/lib/qt4/libQtCore.so.4
#13 0x44039e9c in QApplicationPrivate::dispatchEnterLeave () from /usr/lib/qt4/libQtGui.so.4
#14 0x4403a80a in QApplicationPrivate::sendMouseEvent () from /usr/lib/qt4/libQtGui.so.4
#15 0x44096f11 in QETWidget::translateMouseEvent () from /usr/lib/qt4/libQtGui.so.4
#16 0x440963ba in QApplication::x11ProcessEvent () from /usr/lib/qt4/libQtGui.so.4
#17 0x440bae1e in x11EventSourceDispatch () from /usr/lib/qt4/libQtGui.so.4
#18 0x436288c7 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0