Ok, altbinz works just fine from c:\altbinz; i:\altbinz
On both occasions the default directory under the Explrorer tab was c:\Users\_YOUR_USERNAME_\AppData\Local\Alt.Binz\download
However, when I copied it to d:\altbinz, it froze again. I let it sit for almost 30 mins, no "unfreeze" happened. So it definitely has problems with it being on drive d:
Nzb autoload is not ticked, i don't use the feature