When SoE removed the ability to have chat on multiple lines, I think I was able to crash EQ2 using some sequence of control characters trying to find an alternate solution, but I don't remember what I did. At any rate, ACT only uses 0x0A (\n).
Once in a blue moon someone is able to crash EQ2 by pasting, but I've never received enough reports to look into it. Not that I could fix anything. The reason I responded the way I did was because usually people think ACT does something magic.
