Hewoo!
Sorry for being late. I did some tests and these are the results:
First I downloaded three voicebanks of Yokune Ruko (And two of them seems to be the same XD) so now I'm with a lot of Yokunes in my pc e.e I tested with 2 more voicebanks, Ken (CV) and Daltaine (VCV). I tried to use the ust before extract and after extract, also I was with my configurations and just used resampler and resampler.dll.
Before I extracted the ust wasn't working, with Yokune and Daltaine, the ust had the same trouble as yours with my utau just closing. I used resampler.dll to render that.
After I tried again, but this time I used both resamplers and Yokune two voicebanks, Ken voicebank and Daltaine vb. Strangely it worked fine with both resamplers and with all voicebanks. (Idk if you know that, but I think it's good to 0 the consonant velocity value. It wasn't what solved the problem to me, but it made the ust easier to understand. Maybe if you 0 the Consonant Velocity the problem will resolve by itself)
So I tried again with the two resamplers and all vbs, but this time I opened the ust before extract it and... it worked well! e.e
At the end I believe that you should try extract the ust, but Idk if it will really help you. It helped me to solve the same problem that you had when I did the tests, but it can be other thing! :P
Utau don't help sometimes, but I hope you can find a solution to the problem soon! ^^
See ya~