UMS Slave Window Question

[Sodon]

So I'm trying to use the slave windows for a conversation in my game.

Text1: \face[]\nm[Sodon]\e[0]This is the guy?\slv[t1]
Text2: \face[]\nm[Aekenon]\e[7]Are \slv[t1]you sure?

When the event runs, Aekenon's line appears over his head (I've enabled comic mode for this event only), but Sodon's does not appear anywhere, and pressing Enter does not do anything - the game essentially freezes up.

I enabled FIT_TO_WINDOW_MODE for this as well.

I know this is probably not enough information... But I'm not sure what is relevant. The only other script in my game is Window_LevelUp. Any ideas? Thanks!