[I've tried browsing this subject, but can't claim to have spent a day tracking down other posts relating to it]
I recently added a category "industry commentary", underneath "technology" (which is in itself under "general"). I did this while writing a post. The "industry commentary" category it got attached to the post and is listed as a category in my sidebar widget, but never appeared in my list of categories in dashboard.
Assuming that maybe WordPress might catch up and update itself later I pressed on with creating some sub-categories of this, including "sas", "ibm", "oracle" etc. When I created each of these, "industry commentary" appeared as a parent option in the drop down. Again my category widget shows general->technology->industry commentary->ibm and the rest fine.
I can filter post quite happily in dashboard using "industry commentary" and its children, however the category still does not appear on the category list/edit page in dashboard. I had two pages, it was on neither. So I increased the number shown to more than my total categories, still invisible. Then I search for it, nothing returned.
I also noticed that the ibm, sas etc. categories have a weird structure to them when I click on them. An example appears below:
It's like the hierarchy is being descended from "general" down to "industry commentary" at which point the next level has all the prior ones included in it?!?!?
By way of contrast, here is a more normal URL:
Have I hit some limit on the nesting of categories, or (as I am beginning to suspect) does "industry commentary" have some sort of shadowy half existence (a al Schroedinger's cat).
I can't even delete "industry category" and start again as it is not selectable in the edit categories panel.
I am very confused now.
The blog I need help with is peterthomas.wordpress.com.