Woah, so many replies and I didn't get a single notification...
Well...
Your files have a problem, press Select while launching the app and stay pressed until you see the backgrounds of the Selector, you'll be on the menu to set the files.
So, yeah, I'll update the Selector with 3.4P3, will work on it today to release it on the weekend.

In the mean time, I recommend to not replace the one named ntr_3_4 but the ntr.bin at the root and loading it with 3.2 option.
Reason is that the 3_3 and 3_4 are patched, so replacing them with stock binary might leads to problems in a few features of NTR (like being unable to load a plugin).