Windows 10 Update 1703 for Windows 10 Enterprise made UI Automation unstable.

[Treexters]

Hi, after update 1703 for Windows 10 Enterprise UI Automation becomes unstable due to COM responses.

Simple calls to find objects are now throwing this:

System.Runtime.InteropServices.COMException (0x80131505): Operation timed out. (Exception from HRESULT: 0x80131505)
at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
at MS.Internal.Automation.UiaCoreApi.CheckError(Int32 hr)
at MS.Internal.Automation.UiaCoreApi.UiaFind(SafeNodeHandle hnode, UiaFindParams findParams, Condition findCondition, UiaCacheRequest request)
at System.Windows.Automation.AutomationElement.Find(TreeScope scope, Condition condition, UiaCacheRequest request, Boolean findFirst, BackgroundWorker worker)
at System.Windows.Automation.AutomationElement.FindFirst(TreeScope scope, Condition condition)


And sometimes this:

System.Runtime.InteropServices.COMException : Checking whether server is LowBox
at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
at System.Runtime.InteropServices.Marshal.ThrowExceptionForHR(Int32 errorCode)
at MS.Internal.Automation.UiaCoreApi.CheckError(Int32 hr)
at MS.Internal.Automation.UiaCoreApi.UiaFind(SafeNodeHandle hnode, UiaFindParams findParams, Condition findCondition, UiaCacheRequest request)
at System.Windows.Automation.AutomationElement.Find(TreeScope scope, Condition condition, UiaCacheRequest request, Boolean findFirst, BackgroundWorker worker)
at System.Windows.Automation.AutomationElement.FindFirst(TreeScope scope, Condition condition)


We used our automation based on UIA for years till now, and now it becomes unstable and we cannot do anything about it.

It happens occasionally.

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