Hello,

I have encountered a problem with my relaxation calculations.

When I run the job using 2018 version of ABINIT (8.8.4) the whole relaxation procedure gives the exact opposite effect: starting from nearly relaxed structure I get something very much worse and eventually the calculations just crashed.

I completed the same job using 2016 version of ABINIT and everything went smoothly.

I've had problems with several different materials, which implies that there can be something different in the newest version of ABINIT.

I have attached the '.out' files for both unstable (2018 version) and stable (2016 version) relaxations.

Could you please tell me if there have been big changes between the versions? Some input that must be added or something else...

Thank you!

Best regards, Mikhail