When opening the PCB file below QucsStudio reproducibly crashes on my system when Mesh is set to a low value (e.g. Mesh=5).
File:
<QucsStudio Layout 3.3.2>
<Properties>
DataSet=Band-8_EM.dat
DataDisplay=Band-8_EM.dpl
OpenDisplay=1
Grid=1 mm
Mesh=10
Excite=2|0.0001|1000
Frequency=100MHz|12GHz|101
Boundary=5.82mm|2.4mm|0
Substrate=Sub1|4.6|200µm|0|2.4e-08|35mm
</Properties>
<Items>
Rectangle MS16 -0.0061 0.0015 0|0|0.01|0.00034
Rectangle MS20 0.0063 0.0017 0|0|0.01796|0.0002
Rectangle MS23 0.0267 0.0017 0|0|0.01796|0.0002
Rectangle MS26 0.0471 0.0017 0|0|0.01796|0.0002
Rectangle MS29 0.0674 0.0016 0|0|0.01796|0.0002
Rectangle MS31 0.0853 0.0018 0|-0.003857|0.0025|0.003857
Rectangle MS15 0.0878 0.0014 0|0|0.01|0.00034
Rectangle MS28 0.065 0.0019 0|-0.005252|0.0025|0.005252
Rectangle MS25 0.0446 0.0019 0|-0.005324|0.0025|0.005324
Rectangle MS22 0.0242 0.0019 0|-0.005252|0.0025|0.005252
Rectangle MS19 0.0038 0.0019 0|-0.003857|0.0025|0.003857
Lumped P1 -0.0058 0.0017 1 2 50 0 0.00034 0
Lumped P2 0.0974 0.0015 2 2 50 0 0.00034 0
</Items>