I have a heirarchical structure of categories for my Posts. (Around three parent categories, each with 2-3 subcategories.)
On saving a post, the system doesn't always keep the same categories. For example, a Post saved in the category "Photos ยป Portraits" and then re-saved is then also in the category "Internet", when that category wasn't selected.
I am using WP 2.8.4 on a standard English installation and the following active plugins.
- Askimet
- Duplicate Sidebar Widgets
- Flexi Pages Widget
- Google XML Sitemaps
- Kimili Flash Embed
- List Subpages
- Markdown Extra
- More Fields
- PostMaster