I have noticed a missing perimeter segment on first layer. The rest of layers looks ok. All files (STL, GCODE and config) are on my dropbox:
i confirm this occurs, not only on first layer, and is especially annoying on bridges.
I can reproduce this. It's horrible.
Bugfix: a bug in Polyline::split_at() caused random loss of perimeter…
… segments. #2495
Fixed, and added regression test. Thank you for reporting.