I would also recommend updating to a current version (V4 is obsolete for some time already).

Regards.

]]>I am working with ATENA 3D v4 to simulate the punching shear failure of two-way slabs,during the anlysis,I always got the information"(*) Warning: Sign of diagonal changed when reducing equation: 1858, (node: 4005, dof_id: 1); value : 143050

(*) Warning: Loss of at least 7 digits in reducing diagonal of equation: 1859, (node: 4005, dof_id: 2); value: 298687

But the calculation is continue.I don't know why.So,I think I need your help.

Many thanks in advance

Lisa