Possible casadi environment problem when using with conda

[ghost]

I am currently using conda as pkg mgr on Win10. I have pinocchio3 on my pc which supports casadi interfaces of python. However, after installing OpEn as instruction, my pinocchio.casadi cannot be imported. with
Process finished with exit code -1073741819 (0xC0000005)
I have to remove OpEn and debugged for a while and finally I found the problem. It is the casadi that did this. I just reinstalled casadi via conda and everyworks. I suspect there is some problem with pip and conda. Whatever, I post this for others who may encounter the same problem.
You can also check to this see if your problem is the same.
stack-of-tasks/pinocchio#1578