Gamepark Holdings released a new v4.0.2 and v4.1.0 firmware that fixes touchscreen problems.

If you upgrade from anything lower than v4.x.x make sure to install v4.0.2 first, unless you want to hold a brick in your hands.

Discussion: http://www.gp32x.com/board/index.php?showtopic=42401&view=findpost&p=614806

http://www.gp2x.com/support/support_view.asp?bunho=25&indexNo=955&page=1&part=00