Model 4.3 vs 4.3b not converging

Hi folks!

I've just updated from 4.3 to 4.3b and I'm trying to get some convergence but to no avail.

I'm using the Mixture Model with the Schiller-Naumann slip model for settling suspensions.

I get convergence for the 4.3 version but with the new version, no luck.

I've already built the model from scratch in 4.3b but it's the same issue.
The reason for not using the 4.3.a version was that same. I couldn't get convergence with my old simulations from 4.3 version.

Does anyone experienced this? Or has any solutions/advices?

Best Regards,

Rui