Cannot open or re-install rekordbox

Mac OSX 10.8.5

MB Pro

Having a bit of a nightmare. Been using rekordbox for a while without a hitch. Then loading in tracks for a show and I get the "application has quit unexpectedly" error message. Basically it just keeps doing that and won't open. So I delete the app and re-install a fresh version 4.3.1 from the site and I still get the error. Then spend a while clearing out all the rekordbox system files in an attempt to do a clean re-install but I STILL get the error when attempting to open the app after the re-install.

No idea what to do! I backed up the files with my playlists but the issue is I just need rekordbox to work - any help here would be massively appreciated.