Hello from Germany!
I'm using PM 4.6.6 on Win 7 Professional (64 bit). I created a Master Keywords List with two keywords. Now I don't need these keywords any more and want to delete them. That works - until the next start from PM. These two keywords appear again at the keywords panel and at the IPTC Stationary Pad, using "Edit Keywords".
Is there any possibility to clear the list and keep it cleared? Now I deleted one word and changed the other to a word I'll need next year, when the second part of the season starts. These changes are kept when I start PM again. But that isn't the solution I want. I want an empty list, where the entries aren't back when I start PM the next time.