Grasshopper renders connections in straight lines?

Hi there,

since i have to work on a linux pc, i installed rhino via wine (wich works surprisingly well!), because from time to time i need grasshopper. Now i know that you guys do not support linux as as the host OS, but there still might be someone who can tell me why the connections in grasshopper render in straight lines like so:

is this some kind of setting? i have never seen that before.

Any idea would be great! Thanks a lot!