If a single machine is receiving an Accessibility Interface not registered error message (full error code below), there's an issue with the .NET Framework:
Source:Accessibility Interface not registered (Exception from HRESULT: 0x80040155)Stack Trace: at Accessibility.IAccessible.get_accParent()
at System.Windows.Forms.AccessibleObject.get_Parent()
at System.Windows.Forms.Control.ControlAccessibleObject.get_Parent()
at Infragistics.Win.UltraControlBase.UltraControlAccessibleObject.GetChildControlAccessibleObject(Int32 index)
at Infragistics.Win.UltraWinExplorerBar.UltraExplorerBar.ExplorerBarAccessibleObject.GetChild(Int32 index)
at Infragistics.Win.UltraWinExplorerBar.UltraExplorerBar.GetAccessibleIndex(UltraExplorerBarGroup group)
at Infragistics.Win.UltraWinExplorerBar.UltraExplorerBar.set_ActiveGroup(UltraExplorerBarGroup value)
at Infragistics.Win.UltraWinExplorerBar.UltraExplorerBarGroup.set_Active(Boolean value)
at Perspective.MainForm.SelectDashboard()
at Perspective.MainForm.LoadCompleted()
at Perspective.MainFormEx.OnLoad(EventArgs e)
at System.Windows.Forms.Form.OnCreateControl()
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)
To resolve this issue, visit the Microsoft Support site to download and install the Microsoft .NET Framework Repair Tool.