Missing Arrow lines in xypic, while using anki

Hello,

I’ve made xypic running on Anki. The matrix is loading without any error-messages. The Problem is, that the lines of the arrows are not showing. I only get the arrowtips. I tried the same methodes as suggested, when someone had problems with the arrowtips. It didn’t helped as well.

I don’t know what I am missing. Maybe you can help me. Thanks in advance :smiley: