Unity 3.5 crashes when trying to open up an editor GUI window

When i open up the editor GUI window for the Color Picker, or the save screen or something, the entire unity program freezes. i get these two errors:

Code (csharp):

1. GUI Window tries to begin rendering while something else has not finished rendering! Either you have a recursive OnGUI rendering, or previous OnGUI did not clean up properly.

Code (csharp):

1. ArgumentException: You can only call GUI functions from inside OnGUI.
2.   at UnityEngine.GUIUtility.CheckOnGUI () [0x00000] in <filename unknown>:0
3.  
4.   at UnityEngine.GUILayout.FlexibleSpace () [0x00000] in <filename unknown>:0
5.  
6.   at UnityEditor.ColorPicker.OnGUI () [0x00000] in <filename unknown>:0
7.  
8.   at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (object,object[],System.Exception)
9.  
10.   at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
11. Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
12.   at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0
13.  
14.   at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) [0x00000] in <filename unknown>:0
15.  
16.   at UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) [0x00000] in <filename unknown>:0
17.  
18.   at UnityEditor.HostView.Invoke (System.String methodName) [0x00000] in <filename unknown>:0
19.  
20.   at UnityEditor.HostView.OnGUI () [0x00000] in <filename unknown>:0
21. UnityEditor.ContainerWindow:INTERNAL_set_position(Rect)
22. UnityEditor.ContainerWindow:set_position(Rect)
23. UnityEditor.ContainerWindow:Show(ShowMode, Boolean, Boolean)
24. UnityEditor.EditorWindow:ShowWithMode(ShowMode)
25. UnityEditor.EditorWindow:ShowAuxWindow()
26. UnityEditor.ColorPicker:Show(GUIView, Color, Boolean)
27. UnityEditor.EditorGUI:DoColorField(Rect, Int32, Color, Boolean, Boolean)
28. UnityEditor.EditorGUI:ColorField(Rect, GUIContent, Color)
29. UnityEditor.EditorGUI:SinglePropertyField(Rect, SerializedProperty, GUIContent)
30. UnityEditor.EditorGUI:PropertyField(Rect, SerializedProperty, GUIContent, Boolean)
31. UnityEditor.EditorGUILayout:PropertyField(SerializedProperty, GUIContent, Boolean, GUILayoutOption[])
32. UnityEditor.EditorGUILayout:PropertyField(SerializedProperty, GUIContent, GUILayoutOption[])
33. UnityEditor.CameraEditor:OnInspectorGUI()
34. UnityEditor.InspectorWindow:DrawEditors(Boolean, Editor[], Boolean)
35. UnityEditor.InspectorWindow:OnGUI()
36. System.Reflection.MonoMethod:InternalInvoke(Object, Object[], Exception)
37. System.Reflection.MonoMethod:Invoke(Object, BindingFlags, Binder, Object[], CultureInfo)
38. System.Reflection.MethodBase:Invoke(Object, Object[])
39. UnityEditor.HostView:Invoke(String, Object)
40. UnityEditor.HostView:Invoke(String)
41. UnityEditor.DockArea:OnGUI()
42.  
43. (Filename:  Line: -1)

This just started happening after i installed the 3.5 developer preview on my computer. It works on my other computer but not on my main computer.

This is not doe to my project because when i open up either a new project or the AngroBots demo it still has the same errors


HP, Windows 7, nVidia GTX 460 graphics card

thx for any help