I tested several 9.3 beta versions, but stayed with 9.2 because of crashes and display issues.  Now I want to give the latest 9.3 a try.

Should I uninstall the previous 9.3 before installing the latest? I don't want to have to set up all the display parameters again.

Hi Mark.

You do not need to remove the earlier versions of 9.3 and any settings you had in your prior 9.3 setups will be preserved.   

If you have further questions or issues regarding this, please open a support ticket.