Ah. Okay, this is a common problem to those who haven't been to the options section in the newer versions of UTAU.
Navigate over to the options (I would suggest having the english patch in UTAU to help you).
In the new window that pops up, there is 5 tabs at the top, and in the first tab, 3 sections of options should appear.
In the 2nd set, there should be an option considering the resampler.dll or something similar. CHECK THIS BOX. IF YOU DO NOT HAVE IT CHECKED IT-WILL-NOT RENDER.
Also, even though it is slower, YOU CAN (but you don't have to) check the box referring to "Check for sound files to prevent voice drop (Slower Rendering)" or something similar. This may help a little bit.
The middle option in the second set of options on the first tab is "Do not use batch file for rendering". This option is grayed out if you have the 3rd option checked, as it uses resampler.exe, which works better than the batch file. It also makes the frq-ing process run by batch file as well.
I hope this helps.
Also, while it is TRUE that Yura-honya's ust's don't use the same resapmler, going into the project properties and checking the checkbox under the part where it asks to specify the resampler tools used causes the resampler to switch to the resampler tools included in UTAU by default for all future usts you open up.