I recently upgraded to OS 5.0 and find the upgrade to be great thus far.. Only one small issue I've noticed my trackball seems out of sync, I have to move the pointer around in order to get the trackball to enter.. Can the trackball be out of sync after an update?
In my experience this is a common problem with the 5.x.x.xxx operating systems. Unfortunitely this isn't addressed until later os's. I was just running 5.0.0.692 and it does not have the "browser click issue". Something we just have to deal with. Hope that helps. This is just my findings, no documentation.