Also, when opening the XY-pic manual, I get tons of these on the terminal:
unusual contents found: [xymatrix [grid [row [cell [char
mathalpha][char U mathalpha][char mathalpha][macro ar][char [
mathalpha][char d mathalpha][char d mathalpha][char r mathalpha][char ]
mathalpha][char mathalpha][macro ar][char [ mathalpha][char d
mathalpha][char r mathalpha][char r mathalpha][char ] mathalpha][char
mathalpha][macro ar][char [ mathalpha][char d mathalpha][char r
mathalpha][char ] mathalpha]][cell ][cell ]][row [cell ][cell [char
mathalpha][char X mathalpha][char mathalpha][sub [symbol times] [char
Z mathalpha]][char mathalpha][char Y mathalpha][char
mathalpha][macro ar][char [ mathalpha][char d mathalpha][char ]
mathalpha][char mathalpha][macro ar][char [ mathalpha][char r
mathalpha][char ] mathalpha][char mathalpha]][cell [char
mathalpha][char X mathalpha][char mathalpha][macro ar][char [
mathalpha][char d mathalpha][char ] mathalpha]]][row [cell ][cell
[char mathalpha][char Y mathalpha][char mathalpha][macro ar][char [
mathalpha][char r mathalpha][char ] mathalpha][char mathalpha]][cell
[char mathalpha][char Z mathalpha][char mathalpha]]]]]
T.
