Short version: if RStudio on Windows 7 crashes when viewing vignettes in HTML format, it may be because those packages specify
knitr::rmarkdown as the vignette engine, instead of
knitr::knitr and you’re using
Longer version with details – read on.
update: looks like this issue relates to the installed version of
rmarkdown (1.3 in my case) – see here for details.