I just finished dungeon that requires dwarf character to complete and got a reward item that grants poison immunity (forgot it's name). At this moment my Guild was Lv2 and has 3 used locker slots, so i wanted to upgrade Guild to Lv3 and put anti-poison amulet in new locker slots, but it's just become unselectable.
It's a bug i suppose, isn't?
http://img856.imageshack.us/img856/2979/ddbug1.jpgOh, by the way. Advisor recommendation on ^ picture says about new challenges in Explorers Guild, but i finished them long ago (have Starter Pack only at that moment). So i think it's a little bug too.
Upd: If you found boss using LEMMISE glyph you got a empty popup window instead of boss introduction.