No periodic output when dumping data

[johnsonjh]

In vshell I don't get any periodic output from running commands like xxd < /dev/urandom or hexyl < /dev/urandom or even just yes and the terminal inside vshell does not redraw nor respond to input (like ^C, etc) until that process is killed.

Also, likely another issue but related - if I run 'screen' inside vshell and have two panes active in vshell, and dump data with xxd < /dev/urandom in the side running 'screen', and then kill xxd in the other pane, vshell crashes.