Actually, I randomly started having the same problem you did, after setting Routine settings to default and loading the default settings preset. It doesn't make any sense, but I'm trying to get to the bottom of what caused it.
Edit: Wait nm, the issue on my end was just due to one of the new settings I was working on for the next version; it's fixed. Try starting a routine and letting it finish, then type echo($PTGm.zMod); into the console and let me know what the value is.