I have a Pearl and recently purchased a Curve on ebay to see if I would like the QWERTY better. The trackball on the Pearl has "travel" and clicks when you press down on it(like pressing a button. The Curve trackball has no downward play and no click or any response tactully when you push it, it does work and execute the choice, but you don't know you did anything till you see the screen.
I thought it was defective and bought an OEM replacement which is supposed to be for the Curve or Pearl, it functions in the same way however.
Is this normal for the Curve!
Thanks for Your help.