[Vibrant Q&A, Help & Troubleshooting] hakatu:
Just run into FC after reboot today. Quick look in syslog confirmed, that this issue could be related to apps and images located on sd card.

D/HomeLoaders( 808): ----> items cloned, ready to refresh UI
I/ActivityManager( 167): Displayed activity com.fede.launcher/.Launcher: 906 ms (total 906 ms)
I/ActivityThread( 820): Publishing provider com.android.calendar: com.android.providers.calendar.CalendarProvider2
W/ResourceType( 808): No known package when getting value for resource number 0xffffffff
W/ImageView( 808): Unable to find resource: -1
W/ImageView( 808): android.content.res.Resources$NotFoundException: Resource ID #0xffffffff
W/ImageView( 808): at android.content.res.Resources.getValue(Resources.java:934)
W/ImageView( 808): at android.content.res.Resources.getDrawable(Resources.java:587)
W/ImageView( 808): at android.widget.ImageView.resolveUri(ImageView.java:489)
W/ImageView( 808): at android.widget.ImageView.setImageResource(ImageView.java:274)
W/ImageView( 808): at java.lang.reflect.Method.invokeNative(Native Method)
W/ImageView( 808): at java.lang.reflect.Method.invoke(Method.java:521)
W/ImageView( 808): at android.widget.RemoteViews$ReflectionAction.apply(RemoteViews.java:477)
W/ImageView( 808): at android.widget.RemoteViews.performApply(RemoteViews.java:955)
W/ImageView( 808): at android.widget.RemoteViews.apply(RemoteViews.java:932)
W/ImageView( 808): at android.appwidget.AppWidgetHostView.updateAppWidget(AppWidgetHostView.java:219)
W/ImageView( 808): at android.appwidget.AppWidgetHostView.updateAppWidget(AppWidgetHostView.java:155)
W/ImageView( 808): at android.appwidget.AppWidgetHost.createView(AppWidgetHost.java:218)
W/ImageView( 808): at com.fede.launcher.Launcher.bindAppWidgets(Launcher.java:4256)
W/ImageView( 808): at com.fede.launcher.Launcher.access$25(Launcher.java:4243)
W/ImageView( 808): at com.fede.launcher.Launcher$DesktopBinder.handleMessage(Launcher.java:5282)
W/ImageView( 808): at android.os.Handler.dispatchMessage(Handler.java:99)
W/ImageView( 808): at android.os.Looper.loop(Looper.java:123)
W/ImageView( 808): at android.app.ActivityThread.main(ActivityThread.java:4627)
W/ImageView( 808): at java.lang.reflect.Method.invokeNative(Native Method)
W/ImageView( 808): at java.lang.reflect.Method.invoke(Method.java:521)
W/ImageView( 808): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
W/ImageView( 808): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
W/ImageView( 808): at dalvik.system.NativeStart.main(Native Method)
W/ResourceType( 808): No known package when getting value for resource number 0xffffffff
W/ImageView( 808): Unable to find resource: -1
W/ImageView( 808): android.content.res.Resources$NotFoundException: Resource ID #0xffffffff
W/ImageView( 808): at android.content.res.Resources.getValue(Resources.java:934)
W/ImageView( 808): at android.content.res.Resources.getDrawable(Resources.java:587)
W/ImageView( 808): at android.widget.ImageView.resolveUri(ImageView.java:489)
W/ImageView( 808): at android.widget.ImageView.onMeasure(ImageView.java:592)
W/ImageView( 808): at android.view.View.measure(View.java:8215)
W/ImageView( 808): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:581)
W/ImageView( 808): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:365)
W/ImageView( 808): at android.view.View.measure(View.java:8215)
W/ImageView( 808): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
W/ImageView( 808): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
W/ImageView( 808): at android.view.View.measure(View.java:8215)
W/ImageView( 808): at com.fede.launcher.CellLayout.onMeasure(CellLayout.java:827)
W/ImageView( 808): at android.view.View.measure(View.java:8215)
W/ImageView( 808): at com.fede.launcher.Workspace.onMeasure(Workspace.java:1669)
W/ImageView( 808): at android.view.View.measure(View.java:8215)
W/ImageView( 808): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
W/ImageView( 808): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
W/ImageView( 808): at android.view.View.measure(View.java:8215)
W/ImageView( 808): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
W/ImageView( 808): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
W/ImageView( 808): at android.view.View.measure(View.java:8215)
W/ImageView( 808): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
W/ImageView( 808): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
W/ImageView( 808): at android.view.View.measure(View.java:8215)
W/ImageView( 808): at android.view.ViewRoot.performTraversals(ViewRoot.java:801)
W/ImageView( 808): at android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
W/ImageView( 808): at android.os.Handler.dispatchMessage(Handler.java:99)
W/ImageView( 808): at android.os.Looper.loop(Looper.java:123)
W/ImageView( 808): at android.app.ActivityThread.main(ActivityThread.java:4627)
W/ImageView( 808): at java.lang.reflect.Method.invokeNative(Native Method)
W/ImageView( 808): at java.lang.reflect.Method.invoke(Method.java:521)
W/ImageView( 808): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
W/ImageView( 808): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
W/ImageView( 808): at dalvik.system.NativeStart.main(Native Method)
W/ResourceType( 808): No known package when getting value for resource number 0xffffffff
W/ImageView( 808): Unable to find resource: -1
W/ImageView( 808): android.content.res.Resources$NotFoundException: Resource ID #0xffffffff
W/ImageView( 808): at android.content.res.Resources.getValue(Resources.java:934)
W/ImageView( 808): at android.content.res.Resources.getDrawable(Resources.java:587)
W/ImageView( 808): at android.widget.ImageView.resolveUri(ImageView.java:489)
W/ImageView( 808): at android.widget.ImageView.onMeasure(ImageView.java:592)
W/ImageView( 808): at android.view.View.measure(View.java:8215)
W/ImageView( 808): at android.widget.RelativeLayout.measureChild(RelativeLayout.java:566)
W/ImageView( 808): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:381)
W/ImageView( 808): at android.view.View.measure(View.java:8215)
W/ImageView( 808): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
W/ImageView( 808): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
W/ImageView( 808): at android.view.View.measure(View.java:8215)
W/ImageView( 808): at com.fede.launcher.CellLayout.onMeasure(CellLayout.java:827)
W/ImageView( 808): at android.view.View.measure(View.java:8215)
W/ImageView( 808): at com.fede.launcher.Workspace.onMeasure(Workspace.java:1669)
W/ImageView( 808): at android.view.View.measure(View.java:8215)
W/ImageView( 808): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
W/ImageView( 808): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
W/ImageView( 808): at android.view.View.measure(View.java:8215)
W/ImageView( 808): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
W/ImageView( 808): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
W/ImageView( 808): at android.view.View.measure(View.java:8215)
W/ImageView( 808): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132)
W/ImageView( 808): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245)
W/ImageView( 808): at android.view.View.measure(View.java:8215)
W/ImageView( 808): at android.view.ViewRoot.performTraversals(ViewRoot.java:801)
W/ImageView( 808): at android.view.ViewRoot.handleMessage(ViewRoot.java:1727)
W/ImageView( 808): at android.os.Handler.dispatchMessage(Handler.java:99)
W/ImageView( 808): at android.os.Looper.loop(Looper.java:123)
W/ImageView( 808): at android.app.ActivityThread.main(ActivityThread.java:4627)
W/ImageView( 808): at java.lang.reflect.Method.invokeNative(Native Method)
W/ImageView( 808): at java.lang.reflect.Method.invoke(Method.java:521)
W/ImageView( 808): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
W/ImageView( 808): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
W/ImageView( 808): at dalvik.system.NativeStart.main(Native Method)

I think, that this refers to all images I've used for my desktop shortcuts. Nearly all of my shortcuts have custom icons ;)