I too had problems with ebl 3.0 It crashed every time I hooked up the 600. After reading through a lot of threads here on MR and trying out different suggestions I found a solution which worked for me (don't remember where exactly on MR though
). It entails shutting off DEP (Data execution prevention). I'm not exactly a computer whizz, but I realise that by doing this I lower the safety of my pc. In this setting DEP only works for essential Window components. The wiki has a good page on DEP.
My ebl 3.0 works faultlessly now (I had no trouble with ADE at any time, but this still works as well). So perhaps it's worth trying. It's a bit of a hassle to have to shut off DEP every time I want to hook up the reader as it requires a windows reboot, and having to change the setting again after I'm finished, but I got it working again. You could always choose to do without ebl and just use Calibre for instance.