When two users are logged on at the same time to a Tablet PC that is running Windows Vista, touch input may stop working. This problem may occur if the following conditions are true:

• One user has a standard user account.
• The other user has an administrator user account.
• Both users use the Fast User Switching feature to switch users without logging off.

When the second user uses the Fast User Switching feature, the Welcome screen appears, and touch input stops working.

After you try to start an application that requires administrative credentials in Windows Vista, a User Account Control dialog box appears and asks you for permission to continue. If you click Continue to switch from a user account context to Admin Approval Mode, a second User Account Control dialog box prompts you to provide the password for an administrator account. However, the desktop and the Tablet PC Input Panel are unavailable when the Tablet PC Input Panel is running in Admin Approval Mode. Therefore, you cannot use the Tablet PC Input Panel to type your credentials in the dialog box.

When you are prompted for an administrator password or for a confirmation in Windows Vista, the Tablet PC Input Panel tool is unavailable. This problem occurs when the User Account Control dialog box or a confirmation dialog box is displayed on a secure desktop.

When you change the input language in Windows Vista, the writing pad and the character pad may become unavailable on the Tablet PC Input Panel. Additionally, the writing pad button and the character button pad are unavailable. This problem may occur after you change the input language multiple times by using the language bar on the Tablet PC Input Panel or on the taskbar.

After you opt in to Automatic Learning in Windows Vista, you experience the following symptoms:

• The Handwriting recognition personalization tool does not gather some English text from the message bodies of e-mail messages in Windows Mail.
• The Handwriting recognition personalization tool incorrectly gathers non-English text from the message bodies of e-mail messages in Windows Mail.

You experience this problem when you use Windows Vista on a Tablet PC.