Why does display only refresh when mouse moves?

I am running a program written in Delphi 6 that takes in real time data through a USB/serial connection.
The program runs OK on other XP machines, but on the EEE PC 1000H the plots (chart components) and data displays (memo components) only refresh when the mouse or pad is moved.
This is true for compiled code as well as development code
I have tried to force refresh in the code, but that does not work and, in any event, the fact that the code runs OK on other machines suggests a hardware glitch.
In the past I would have suspected IRQ conflicts - for info, the elantech smartpad is IRQ 12, the USB ports are 16, 18, 19 & 23 -  I have tried disabling the smartpad, but the problem still exists.
Any help appreciated.

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What other USB devices do you have on the hub?  I'm thinking there is a defective device plugged in.  Try removing everything except for the one required for your application and see if that resolves it.  If it does, plug in the other devices one at a time to determine which one is at fault.

ColMacFAuthor Commented:

Thanks for the quick reponse.  I've tried that and cycled round all the usb ports with the usb/serial unit as well.  I have not tried disabling the wireless but will do so when my son stops viewing a movie on the laptop!!  The wireless shares an IRQ (19) with one USB, but that shouldn't cause a problem on other USB ports?
It could.  As you had initially though, I was thinking an IRQ problem.  But I've seen really odd stuff with USB devices messing things up.  Had one computer that wouldn't boot with a USB printer plugged in.

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ColMacFAuthor Commented:
I'll try disabling the wireless later tonight then post any changes
Sounds like it could be related to graphics drivers. Are there updates available?
ColMacFAuthor Commented:
I accessed the ASUS support page last week and there were no new drivers or updates.  Following your advice 'Rid' I looked again and there's a page of them.  I'll install all the system updates and also test with the wireless disabled.  There is a VGA update that I'll try first.  
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