I'm using a pair of SunRay 2 thin-clients in a dual-head configuration (via SRSS, with Xinerama). On the secondary display, the mouse cursor will sometimes decide to jump to the upper left corner of the screen while I'm moving it (very rarely it will jump to other locations). While not moving, it stays in place just fine. However, while in motion it will do that "warp somewhere else" type action. Does not happen when the cursor is on the primary screen. I'm able to replicate the problem on another Solaris server, with SunRay 1g thin-clients at another location too!
Thanks DoxJeremy for hooking me up with the info! Here's the answer he pointed me at: