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Tablet PC mouse pointer randomly appears in the upper left corner of the screen

Medium Priority
Last Modified: 2013-11-29
In a Tablet PC environment the pointer appears randomly in the upper left corner of the screen and a double-click is triggered.

It's a Twinhead T8 ruggedized Tablet running Windows XP Tablet edition. The mouse is pen-based Wacom type. We've been working on this a couple of weeks now. We've scanned for malware and replaced the pen a couple of times.

I've seen a couple of related posts (Q_21515752 and Q_21754730) but they get the standard "you're gear is sooo messed up, dude!" answer.

The strange pointer behavior occures when the pen is nowhere to be seen and the Tablet is idle. We've setup a corded standard mouse only configuration and everything works fine.

We're betting on a hardware malfunction or misconfiguration. If so, I'd like some help figuring out what kind of maintenance shoul we do.

The Tablet operates in a harsh environment: mounted on a fork lift inside a large warehouse. It gets DC power from the lift batteries. The Tablet normally uses a bluetooth based code scanner. It may also get some dust. It's winter now and the equipment has been under -2 °C (28 °F) lately.
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Yeah, that's actually a common phenomeon with tablet PCs.   The contacts for the digitizer (under the LCD) that run along the edges of the screen become intermittant over time.

You can temporarily solve the problem by tapping on the screen with your knukles (like knocking on a door... with about that amount of force) in the vacinity of the "jumping cursor".

The "proper" solution is to send it back for a repair... however, most folks don't find it too annoying, and just continue to knock on the glass whenever it happens.

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