doing
filters/remeshing/subdivision surfaces:midpoint
with this input file
Vertices: 4
Faces: 2
v 0 0 0
v 1 0 0
v 1 1 0
v 1.5 0.5 0
f 1 2 3
f 2 4 3
often leads to assertion errors like: vcglib/fcg/simplex/face/base.h line 220.
this is version 130a, 32-bit windows.
It's really strange because it's only happening with 32 bits version not with the 64 bits. We will try to fix it in the next days.