New version 254 PC HP-1 changes to see if it helps.
https://drive.google.com/file/d/0B_Jndzk4GdzJaUM3ZUp0R3dJMzg/edit?usp=sharing
Please test and let me know.
This time it locked up after 2 seconds.
Tomorrow afternoon (evening), when I have some time, I'll purge the x36HP drivers and the HP1 drivers from this machine, reboot it, and install the HP1 drivers fresh from a new download from the Uniden site, then try it again and see if that makes a difference.
Is there anything like baud rate that could be of concern? The port initially connected as COM41 at 9600, but I changed it to COM8 at 115200. (Tried it both ways with your program, made no difference).