Yup, it happens only with the string edits loaded. Any time I loot a boss or receive a quest item, boop - disconnected. It, of course, doesn't happen with them disabled (or the ones listed removed from the file).
I've been comparing the strings in the file you listed, Phanx, over the last few days and I honestly can't see what's causing me to crash. That's why I'm so confused. At most, I remove a few words and no tokens. As far as I can see, all tokens are in the same order but I'm obviously missing something.
@ Myroddin I've been replacing strings like this with no problem for ages.