DrawAnnotation(context, 0, 0, ","); // i.e. text 0,0 ','
would cause DrawImage to fail because after getting the co-ordinates (0,0), it incorrectly think the next token (which is a ',' character) is a delimiter and skip it.
This happens at line 2625-2627 in magick/render.c.
A scenario of this problem is a wmf with text starting with ",".