Shortest path key makes edges freestyle instead I use a heavily modified shortcuts for blender. I have set "select shortest path" to ctrl+right click and it has worked for a long time until today. 
I am not aware of changing anything recently but suddenly instead of "shortest path" the above shortcut does something weird:
-selects the shortest path
-makes all selected edges freestyle edges
-deselects all

Any idea what's happening?
Here's a fix, I had same problem for  a while where shortest path edge select marked them as freestyle

Apparently I have changed some options on Edge Select mode and forgot. Hope this fixes it