You install a Wacom driver for a multitouch device.
You run a .NET Framework 3.0-based Windows Presentation Foundation (WPF) application that supports the multitouch function on the device.
In this scenario, the multitouch function does not work, and the WPF application does not respond to any touch events.
This issue occurs because the Wacom driver does not support the string descriptor for a device ID.
When the WPF control sends the string descriptor for a device ID, the driver returns a "Not Supported" message. However, the WPF control does not respond to any request that contains the string descriptor for a device ID after the control receives the message.
Note In USB specifications, the string descriptor for a device ID is optional.
A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next that contains this hotfix.
To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft website:
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.
To apply this hotfix, you must have the .NET Framework 3.5 Service Pack 1 (SP1) installed on a computer that is running Windows 7 or Windows Server 2008 R2.
Note The .NET Framework 3.5 SP1 contains the .NET Framework 3.0 Service Pack 2 (SP2).
You do not have to restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix package does not replace a previously released hotfix package.
The English (United States) version of this hotfix package uses a Microsoft Windows Installer package to install the hotfix package. The dates and the times for these files are listed in Coordinated Universal Time (UTC) in the following table. When you view the file information, the date is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
For all supported x86-based versions of Windows 7
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
If a .NET Framework 4.0-based WPF application encounters this issue, install the hotfix that is described in the following Knowledge Base article to resolve this issue:
2328751 FIX: Multitouch devices become unresponsive when you use a .NET Framework 4.0-based WPF application that uses a Wacom driver
Additional file information
Additional file information for all supported x86-based versions of Windows 7
The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.