Hello, The scenario happens in SCOM R2 CU2 environment... I'm creating a new subscription.. give it a name, choose a condition which has to query the DB, for example : "raised by any instance of a specific class" and then the Console freeze\crash... or generating an error (and crash..) : Date: 12/01/2011 14:36:41 Application: System Center Operations Manager 2007 R2 Application Version: 6.1.7221.0 Severity: Error Message: Object reference not set to an instance of an object . System.NullReferenceException: Object reference not set to an instance of an object. at Microsoft.EnterpriseManagement.Mom.Internal.UI.Dialogs.PickerDialogs.GroupClassPickerControlBase.HandleSelectedMPChanged(Object sender, EventArgs e) at System.Windows.Forms.ComboBox.OnSelectedIndexChanged(EventArgs e) at System.Windows.Forms.ComboBox.set_SelectedIndex(Int32 value) at Microsoft.EnterpriseManagement.Mom.Internal.UI.Dialogs.PickerDialogs.GroupClassPickerControlBase.HandleControlLoad(Object sender, EventArgs e) at System.Windows.Forms.UserControl.OnLoad(EventArgs e) at System.Windows.Forms.UserControl.OnCreateControl() at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible) at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible) at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible) at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible) at System.Windows.Forms.Control.CreateControl() at System.Windows.Forms.Control.WmShowWindow(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ScrollableControl.WndProc(Message& m) at System.Windows.Forms.ContainerControl.WndProc(Message& m) at System.Windows.Forms.Form.WmShowWindow(Message& m) at System.Windows.Forms.Form.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.SafeNativeMethods.ShowWindow(HandleRef hWnd, Int32 nCmdShow) at System.Windows.Forms.Control.SetVisibleCore(Boolean value) at System.Windows.Forms.Form.SetVisibleCore(Boolean value) at System.Windows.Forms.Control.set_Visible(Boolean value) at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.RunDialog(Form form) at System.Windows.Forms.Form.ShowDialog(IWin32Window owner) at System.Windows.Forms.Form.ShowDialog() at Microsoft.EnterpriseManagement.Mom.Internal.UI.Dialogs.PickerDialogs.ClassPickerDialog.Microsoft.EnterpriseManagement.Mom.Internal.UI.Controls.ICriteriaEditDialog<System.Guid[]>.ShowEditDialog(Form owner) at Microsoft.EnterpriseManagement.Mom.Internal.UI.Controls.CriteriaItem`1.Edit(LinkLabel linkLabel) at Microsoft.EnterpriseManagement.Mom.Internal.UI.Controls.CriteriaDescriptionControl.CriteriaItemLinkClicked(Object sender, LinkLabelLinkClickedEventArgs e) at System.Windows.Forms.LinkLabel.OnLinkClicked(LinkLabelLinkClickedEventArgs e) at System.Windows.Forms.LinkLabel.OnMouseUp(MouseEventArgs e) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.Label.WndProc(Message& m) at System.Windows.Forms.LinkLabel.WndProc(Message& msg) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg) at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData) at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.RunDialog(Form form) at System.Windows.Forms.Form.ShowDialog(IWin32Window owner) at Microsoft.EnterpriseManagement.Mom.Internal.UI.Administration.Views.SubscriptionsView.OnNewNotificationSubscription(Object sender, CommandEventArgs e) If I will choose other condition like "of specific severity" it wont crash\freeze\generate error... I'm suspecting for corruption .. any idea how to troubleshoot that ? Thank you.

Have this every now and again and it used to drive me crazy!!!! How I got a work round was to install the console on a different machine... the issue is with faulty assemblies. New console (win 7 never lets me down on this issue) Paul Keely

I've tried to install it on win 7 + windows 2008... on some it crashes, on others it generating error... Nothing helps.

Is this always in reference to a particular _instance_ of a class? Have you tried running the console with the /nocache command line option? If the console cache and the database are out of sync, you can refer to things that have been deleted by your administrators. This can happen when an MP has been deleted, for instance. Try other classes, try flushing the console cache ...Microsoft Corporation

Can I ask do you have any subscriptions working? Have you got any SCOM CU on the server, and are you trying this on the RMS? Paul Keely

I dont even get to the step when I choose instance... it crash when im trying to open the instances window... + I've deleted the cache...

I have old working subscriptions... which i didnt try to re config... + as I said, I have CU2 and I tried it from the RMS or some workstation console...

Hi I also noticed this in the list of what CU3 resolves: When using a remote console the notification wizard does not work in certain situations The end user attempts to create a notification subscription for a remote console by using one of the following conditions: Raised by an instance in a specific group Raised by any instance in a specific class Created by specific rules or monitors (e.g. sources) Upon continuing, the “Object reference not set to an instance of an object” error is shown, and the console must be restarted. System Center Operations Manager 2007 R2 Cumulative Update 3 http://support.microsoft.com/kb/2251525 If you want to try CU3, please refer to: OpsMgr 2007 R2 CU3 rollup hotfix ships – and my experience installing it http://blogs.technet.com/b/kevinholman/archive/2010/10/04/opsmgr-2007-r2-cu3-rollup-hotfix-ships-and-my-experience-installing-it.aspx Hope it is helpful. Regards, Leon Leon Liu - Technical Lead

Hi I also noticed this in the list of what CU3 resolves: When using a remote console the notification wizard does not work in certain situations The end user attempts to create a notification subscription for a remote console by using one of the following conditions: Raised by an instance in a specific group Raised by any instance in a specific class Created by specific rules or monitors (e.g. sources) Upon continuing, the “Object reference not set to an instance of an object” error is shown, and the console must be restarted. System Center Operations Manager 2007 R2 Cumulative Update 3 http://support.microsoft.com/kb/2251525 If you want to try CU3, please refer to: OpsMgr 2007 R2 CU3 rollup hotfix ships – and my experience installing it http://blogs.technet.com/b/kevinholman/archive/2010/10/04/opsmgr-2007-r2-cu3-rollup-hotfix-ships-and-my-experience-installing-it.aspx Hope it is helpful. Regards, Leon Leon Liu - Technical Lead

I had on my list to upgrade to CU3... I'll update if it helped to solve the problem.