Any plotting package is hanging, even for very simple plots. Here is my sample code:

user.desktop% R

R version 3.2.1 (2015-06-18) -- "World-Famous Astronaut"
Copyright (C) 2015 The R Foundation for Statistical Computing
Platform: x86_64-redhat-linux-gnu (64-bit)

R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.

  Natural language support but running in an English locale

R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.

Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.

> d <- data.frame(x = 1:10, y = (1:10)^2)
> plot(d$x, d$y)

The window hangs from here until I terminate the session. The code works fine on Windows 3.2.2. Any ideas what's going wrong here?

Update:

Reconstructed output from capabilites() from comments:

> data.frame(capabilities())
capabilities..
jpeg                  TRUE
png                   TRUE
tiff                  TRUE
tcltk                 TRUE
X11                   TRUE
aqua                  FALSE
http/ftp              TRUE
sockets               TRUE
libxml                TRUE
fifo                  TRUE
cledit                TRUE
iconv                 TRUE
NLS                   TRUE
profmem               FALSE
cairo                 TRUE
ICU                   FALSE
long.double           TRUE
libcurl               FALSE