FindChild not working within For loop

I am currently beating my head against a very annoying problem. In one place in my code I am using FindChild, and it isn't finding the child. Thing is, the command works outside the For loop, but inside it doesn't work. Also, it works the first time through the loop, it's on the second pass that an error happens. Does anyone have any idea why this would be?

This is pissing me off, because I'm pretty sure I'm just missing something obvious. If anyone would like me to send you the code to look at, just email me.