Acroread vs. ctrl/z

[Jonathan Ryshpan]

When Adobe acroread is run from a terminal, ctrl/z doesn't suspend it.
^Z appears on the terminal, which hangs until acroread terminates itself
or ctrl/c is pressed on the terminal.  However "$ acroread &" starts
acroread in the background and ctrl/z suspends all other programs, as
expected.  System is Fedora-19 with all updates installed.

Has anyone else seen this?  What's going on?