Not working for me.
I have enabled fixed category positions and fixed category positions on create and have assigned numeric priorities such that my most preferred category appears above my less preferred category in the reorder categories dialog, and have clicked the save button.
Closing and reopening my browser, clearing the browser cache, logging back in as administrator and checking the category order showing in the reorder categories dialog shows the settings were saved - however still the less preferred category always displays first by default when the site is first opened - even though it has less recent posts than the preferred category.
Is there another setting somewhere that might be interfering with preferred category order?
Until a recent rebuild, this was not an issue, - though I had also played around with a few settings at the time (which I now don’t remember), so unclear whether this is a software or user defect.