Re: Oracle WebApp 11i - web_image_link fail in other systems
You can find information about this function in Help->Function reference -> Search -> type web_image_link
In your case you should review Function Uses -> Clicking on an Image Link
The difference between "ClickCoordinates=4,8", and "ClickCoordinates=100,100", is too big.
What I would suggest you instead of guessing, record a new script with the same business process on the new machine and check the correct coordinates. Please also check in this step if there will be other differences in Description and Action part.