Remember how you traversed a string in C? Typically you wrote something like this (and yes, I know I probably should have used a pointer):

char pszString[100] = "My silly string\0";
for (int i=0; i<strlen(pszString); i++) {
   char ch = pszString[i];
   //do something spiffy
}

As far as I remember, I use that all the time in JavaScript as well. I never had any issues. Guess what? In IE on VM that was the cause of my problems. So, all I had to do was:

var pszString = new String("My silly string");
for (int i=0; i<strlen(pszString); i++) {
   char ch = pszString.substr(i, 1);
   //do something spiffy
}

And the stuff magically started to work.