When I create a new connection to a RAC instance, I get a "Verify Cluster Connection Details" dialog box. There are no buttons displayed on the box. The box lists all the nodes and wants you to map it to TNS entries of the individual instances. If I set it up I can't save it.
The DPI setting was changed from 96 to 120. This makes the text easier to see on a large screen, but Spotlight does not deal well with that.
Change the DPI setting back to 96 and you should see all the buttons there were not on the "Verify Cluster Connection Details" dialog box.