After either an automatic upgrade of XP, or Java ( both occurred in a narrow time window around June 14, 2012, zParts started failing. The symptom will appear whenever you add a category in a hierarchy. That category does get created, and parts can be added. Afterwards, returning to the category will find it blank, and the top of the tree of all categories will also go blank. Removal of the category created after June 14, 2012 allows views of top level categories. In sum, I can't add any more categories without breaking zParts. I have moved zParts to Linux, where it still functions. I will have to wait until I have a need to upgrade Java on Linux to determine if it was a Java upgrade that caused the failure. Otherwise, some XP upgrade patch may be the cause.
categories.ini