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Backspace culling options are a problem. Version 3.7.90
Backspace culling options are a problem. Version 3.7.90
Backspace Culling Check in Graphics Options
Transform attachment into mesh
Click the Create Mesh button several times
Nothing will be shown on the screen.
When transformed into a mesh, the attachment must be facing the front.
but mesh is looking at the back. 
I believe you are saying that with Backface culling enabled, clicking Generate on the Edit Mesh dialog causes the mesh to not be drawn. I see the same behavior. You can track the issue here:
https://waffle.io/EsotericSoftware/spine/cards/5c7e1a8336b73e02d8414f79
Thanks for reporting the problem!