Applicable Configuration:
BYOND Version: 429.999
Operating System: Windows XP Pro SP2
Web Browser: Firefox
Game/Hub(s): All my projects

Descriptive Problem Summary:
When editing an interface, if you turn on Multi-Line on your Interface's Input Box, I've noticed that at least the directional macros lose ability to work.
For example, you turn on Multi-Line, and when you go in-game, you try to press Up/Down/Left/Right on your keyboard and they do not respond. I have been unable to get them to work without turning off Multi-Line.

Numbered Steps to Reproduce Problem:
Create an interface with a Map and Input Window.
Turn on Multi-Line on the Input window.
Try to move in-game.

Expected Results:
Macros and everything should work unless you select the Input Bar for Input

Actual Results:
Input Bars takes priority and macros stop working, including arrow keys.

Does the problem occur:
Every time? Or how often? Everytime.
In other games? Yes.
On other computers? Didn't Try.
In other user accounts? Didn't Try.

When does the problem NOT occur?
As long as the Input Bar does not have Multi-Line enabled, nothing is wrong.

Workarounds:
Don't use Multi-Line on the Input Bar.