Hm, which mods do you have that have extension tools? I guess I could test it. Also, sending client.log from a session where the error occurred would helpIs it me but the gui messes up when i press the extension tools, the arrow disappears (the one to toggle gui visibility) and the extension tools dont pop up, and if you DO close the gui, it like, disappears, no arrow to toggle it, but the other tools still work.