Editor interface

Stupid question from an artist here.
Somehow all my lights and particle effects in the scene i'm working on are no longer visible.
I can select them in the hierarchy list, but the icons and light cones are no visible. I must have turned something off, but cant figure out what it is. Thanks for any help.

 

Select one of your objects in the Hierarchy list and hit the "F" key (this frames the selected object in the Scene View)... do they show up now?

 

it zoomed in properly, however, the only thing that showed up was my x,y,z manipulators.

Just noticed this error, not sure if its related.

No Assert String available
UnityEditor.Handles:Internal_DrawBuiltinGizmos()
UnityEditor.Handles:Internal_DrawBuiltinGizmos()
UnityEditor.HandlesrawBuiltinGizmos() (at C:\builds\unity-trunk\unity\Editor\Mono\Generated\EditorHandles.cs:546)
UnityEditor.SceneView:OnGUI() (at C:\builds\unity-trunk\unity\Editor\Mono\SceneView\SceneView.cs:369)
System.Reflection.MonoMethod:InternalInvoke(Object, Object[])
System.Reflection.MonoMethod:InternalInvoke(Object, Object[])
System.Reflection.MonoMethod:Invoke(Object, BindingFlags, Binder, Object[], CultureInfo)
System.Reflection.MethodBase:Invoke(Object, Object[])
UnityEditor.HostView:Invoke(String) (at C:\builds\unity-trunk\unity\Editor\Mono\GUI\DockArea.cs:156)
UnityEditor.DockArea:OnGUI() (at C:\builds\unity-trunk\unity\Editor\Mono\GUI\DockArea.cs:491)

[..\..\Runtime\GfxDevice\d3d\GfxDeviceD3D9.cpp line 2532]

 

ugh, system restart fixed it.
Should have tried that first, sorry guys.