Hey guys, sorry to hear that you guys are experiencing this problem. The issue is known and a fix is on it’s way! Please be patient and it’ll be fixed as soon as it can.
Source: Nexon Forums - Cannot redem Seals of Dedication!?!?
I know it's not a major thread or anything and just a GM reply in an obscure thread, but I think this one is important enough to everyone to actually be posted up here.