R shiny crash on loading examples (__cxa_guard_acquire detected deadlock) change default C++ standard library
My similar issue was solved by updating the packages it relies on. I did this with:
install.packages(c("Rcpp", "httpuv", "shiny"))
or in general:
update.packages()
I was having a similar problem. Doing the install this way and then explicitly calling library(Rcpp) in addition to library (shiny) fixed this for me.