Beierxxx

I observed with Cura 15.04.4 when loading a gcode file (the sample file was about 25 MB) that several layers (1 to n) are not shown in "Layer View" mode. When moving the layer slider to (n+1) the layer (n+1) is shown, "hovering" above the buildplate in its true vertical position. Depending on the file, the first 30 to 120 layers are not shown. In parallel, in normal view mode, I cannot see the complete model (means, nothing is to be seen). Can anyone help, please, thanks!