I am encounter the same problems everyone is having with Manage category. Last night I accidentally create a duplicate category, so I delete it that when it all started. WP doesn’t allow me to manage category any more. bierflesje you mentioned that you can create a new category by writing a new post under the write-new-post screen. I went there but under the category are the categories that are already there, but I did not see any option to add a new category….Can you explain how you create a new category under write-new-post screen?
I which this problem can be solved. My site is Categories intensive and it would not work if I can’t create new categories… WP is great but this is driving me crazy.