Having just upgraded to OS 10.2.3 I have been getting on pretty well, but just recently have become aware of a problem with a hesitant/sticking cursor. In Classic (Quark) and in X (Photoshop), it is the same. Restarting, swapping mouse and experimenting with different surfaces for the mouse hasn't made a difference and I am reluctant to blame hardware as I am unfamiliar with any known issues. Any ideas?