The 1, 2, 3, 4 menu at Battle Isle launch is out of whack, every second line is blank as though the ECHO command has been ignored, it's been like this for years and it's bugging me now that it hasn't been fixed. Anyone know how to fix it?

Assuming you have everything in the default folders, navigate to the C:\GOG Games\Battle Isle folder and then open the dosboxBI1_single.conf file with any text editor (Notepad will work just fine).

Add "@echo off" as below:
[autoexec]
# Lines in this section will be run at startup.
@echo off
cls