Good points, Mats.
"I can run a similar example without problem. I do not use the "snap through"-option. If I use this I too get an error message. "
I've noticed that there appears to be something wrong with solver for Creo. There's a benchmark snap-through model that solves perfectly fine in WF5, but fails to solve in Creo. The model has several loads and constraints to minmic the same event by using either an enforced dispalcement or an applied load (i.e. the enforced displacement is always numerically stable, while the applied load isn't). The model has three studies:
WF5
Model 1: Constraints and Enforced Displacement - Solves without issue.
Model 2: Constraints and Applied Load w/ Snap-Through - Solves without issue.
Model 3: Constraints and Applied Load w/o Snap-Through - Failes to solve.
This model shows the functionality of the snap-through feature rather nicely. However, if you try to solve this model in Creo:
Creo 2.0 M100
Model 1: Solves without issue.
Model 2: Fails to solve.
Model 3: Solves, but doesn't obtain the correct reaction load.
Creo 3.0 F000
Model 1: Solves without issue.
Model 2: Fails to solve.
Model 3: Solves, but doesn't obtain the correct reaction load.
I submitted a bug report to PTC about this quite a while ago, but I never heard back from them. It's somewhat concerning that there could (potentially) be such a large bug within the solver.