DDJ RZ causing rekordbox to crash

 So since upgrading (finally) to the 64 bit version of rekordbox, my DDJ RZ now appears to be causing the program to crash or not start at all.

I can start rekordbox without the RZ switched on, but as soon as I power up the controller and rekordbox detects it, I get an 'Unexpected application error' and rekordbox crashes.

If I try to start rekordbox with the RZ switched on, I immediately get the 'Unexpected application error' popup, and the program refuses to start.

I have tried reinstalling drivers, updating firmware (all at latest version) and even reverting back to 32 bit (both rekordbox and DDJ RZ drivers), but with no success.

A dump file seems to be created with every crash, if that helps.

Kind of regretting selling my old CDJ/DJM set up.