It happens often, for example, when you try to click anything on the "border" of game view. Then, mouse goes awkard and crazy. javispedro, I went through everything that was written on TMO (mostkly by you) about touchpad->cursor handling in dosbox, and I think I understand how it works - the problem is, that even if relative cursor movement is exactly as it should (cursor follow touch point on screen perfectly), it goes apeshit and desync as soon as we touch border, on purpose or not. It seems like bug in implementation to me, rather than limitation of dos mouse handling.