RH4 Crash

I'm having an issue with my RH4, every time I create a fixture with the fixture builder when I get to the point of building type the board crashes. My screen goes to black and all the programmer keys stop working, the playbacks still work.
This has happened with different shows, so it's not a corrupted show file.
I'm currently on v 2.4.0 but this also happened with the 3 versions prior to this one.
Hope someone has a clue on this one.