All the files seem to be the right size and everything, I don't really know what the cause is still.
I might just be missing something obvious.
Fortunately, I did figure out a way to nitro-skip past that area and have since been able to reach nearly the end of Noiz's route. I was pretty stubborn about having his route be the first one I completed, so no, I haven't tried the others yet haha....
It's not uncommon for Crossover to freeze the image if I right click at a weird time (like in the middle of an animation), but the sound keeps going. However, this is always fixed by quitting and reopening. This one part with the guard dog allmate's first appearance is the only one that seems to permanently freeze.
I'm really not sure what happened, but at least I figured out that I need to have "Skip Unread Text" checked in order for nitro-skip to work correctly in case something similar happens in other routes. (Koujaku is next <3)