Hi all, There have been some recent issues that have popped up when parameter file storage is used when accessing different parameter files at the same time in a parallel job. While the long term solution is to move to something thread-safe like sqlite, I am of the opinion that for now we should turn off this capability by default. We would leave the capability in there, and it would be turned on with: from yt.config import ytcfg; ytcfg["yt", "storeparameterfiles"] = "True" at the very top of a yt script. Since this could disrupt some people's workflows, I think a +/-1 would be helpful, along with any strong opinions. Thanks, Sam