This switchgrass?
So far in all my time using it I've never had any crashes or file incompatibilities. The grass ends up in nearly all my builds.
Out of curiosity I downloaded the Splashing Horse (link) to test and I have not yet been able to reproduce the issue, I am trying both the Habitat and Decorative versions.
Interestingly enough, I also had my first contest zoo file crash just recently. I'm getting a consistent crash with some (but not all) colors of the coloured concrete fences, whenever I put them in a situation where it has to render the gate piece. They seem stable as long as I don't make the game try to pull the gate piece (like by enclosing an exhibit with it, or manually trying to move the gate onto a section of it.) Game hangs for a moment then closes.
There's a lot of them and I haven't tested all of them. Some of them do it, some of them don't.