Well, I also found a workaround. All it took was a simple [ onclick="this.focus();" ] for the input box and now it works!
At this time, I'm unsure how to fix the code to allow entering an input box without having to use the onclick. I'll look around the code later and see if I can do anything and I'll post back if I do get something working.
EDIT: On second thought, a fix in the script itself will probably be necessary. Even when using my fix above, working with input boxes is not perfect. Selecting text in the input box is impossible with the onmousedown event.