DrawDebugLine is broken in VR with the HTC . It only draws correctly in the right eye, the transform of the line in the left eye is messed up.
Things work great in 4.12.
Hello timtimmy,
After further testing I believe that this in a known issue. I have provided a link to the public tracker and I have made a note on the report itself. Thank you for your time and information.
Link: Unreal Engine Issues and Bug Tracker (UE-34600)
Make it a great day