Things were working perfectly until yesterday but after restarting my Mac this weird issue with the select/marque tool has started occurring. Whenever I drag to select anything the dotted outline is not shown. This makes it quite difficult to be accurate. Photoshop seems to work in all other aspects.
Note when I launched Photoshop the first time after rebooting it did take some time to start and then showed an error saying something like "couldn't find Display Driver". I guess this is potentially related.