1) Please check the setting in your `Layer Options...` to ensure that you do not have inner layers 3 and 4 ticked: ![enter image description here][1] 2) Please also check your Gerber files form the Fabrication output to ensure that they do not have inner layers 3 and 4. After carrying out these two checks, please post back to this Bug Report with your findings. Thanks. [1]: /editor/20171007/59d805110326c.png

Hi Andy. After I deselect inner 3 and 4, the fabrication output seems to generated only inner 1 e inner 2, which is Ok. I used https://gerber-viewer.easyeda.com and checked the gerber zip file. I noticed 2 files, gerber-drill.g1 and gerber-drill.g2, and I suppose these corresponds to 2 layers only (inner ones), so it seems that everything is fine. Sorry, I did not know that I must go to Miscellaneous and Layers settings. I thought that fabrication output automatically detect the number of layers. Thank you and Regards. Angelo