Thanks Dunny. I've made sure in the comtrol panel that the value for administrators is set to "1" in the "Edit any post" section of Forum Permissions. Thats the first thing I checked. Then I checked to make sure that I'm and admin smile. Then I tried to edit other posts in that same forum that were both older and newer.

Within this post are several links to threads that were posted in our old system using UBB Threads 6.5. Could those links be the problem?