run.exe will not work with upgrade from 1.14.4 to 1.16.3

i have been running cygwin/x for a long time. i was on 1.14.4 and
decided to upgrade to 1.16.3. the problem is that i am unable to start
an xterm from a dos prompt. i have been using the following command
line for years now:

D:\cygwin\bin\run.exe -p /bin bash ~/scripts/xtermLaptop

the contents of xtermLaptop are:

#!/usr/bin/env bash

export DISPLAY=127.0.0.1:0.0
xterm -geometry 80x75 -sb -rightbar &
exit

this has worked for years, now when i run this command, a window very
briefly blinks into existence but then goes away. any idea why this
would stop working now?

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