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dotnet/releases/net471/KnownIssues/479874-WPF Touch Stops Work...

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WPF Touch Stops Working After Rapid/Prolonged Use Of Popups

Symptoms

On a touch or stylus-enabled machine, WPF applications may see a loss of touch or stylus after rapid or prolonged use of popups (e.g. ComboBoxes, DropDown Menus).

Cause

A change to disposal of HwndSource in .NET 4.7 caused Popups to not correctly cleanup touch resources. This eventually can lead to loss of touch/stylus interaction.

Resolution

This issue is fixed for all supported OS platforms prior to Windows 10 Fall Creators Update. The fix for Windows 10 Fall Creators Update is expected in a future servicing update.