Iray Shading and Render Inconsistent

phong3d

I bought the Bristol hair today, and while working with it on some characters, I noticed that while it renders perfectly in Iray, if I set the viewport to Iray rendering, it only shows the hair cap. The cap colors change if I play with those, but the strands don't show up. 

I have other dForce/Iray hair, and this is the first time I've seen behavior like this. Is this specific to the Bristol hair itself? It isn't some massive problem if it's only in viewport rendering, but I just want to be sure it's not indicative of some other issues I should be aware of. Also, I do get the same behavior when I switch from GPU to CPU rendering, and both photoreal/interactive modes are set to CUDA cores. No other isssues with GPU rendering an any other environments (I ran a short job from Houdini through Redshift and it's fine)

Edit: Ugh, never mind. There's literally a "Preview Render On" button that I didn't notice. For my next trick, I'll attempt to tie some velcro shoes.