I'm having a similar problem that I think is related. To reproduce: Create a new drawing Add a new construction layer Set the line type to dot (tiny) - Note: it doesn't happen when you use contiuous, but I tested dashed also, and it did happen with that style. Add a horizontal and vertical line on the new layer. Create a few offset lines from each. * Try to zoom in several levels. It always freezes on mine at this point. System Info: Version: 2.1.2 Compiler: GNU GCC 6.2.0 Compiled on: Sep 17 2016...