I have been playing offline mode and have been having trouble completing various quests. I can speak with the NPC, and the trade window opens, I place the quest item in the trade window but nothing happens when I click the button to complete. Sometimes I can't even cancel the action (trade window stays open). I've discovered that closing out the client and restarting helps temporarily, but the bug seems to return. I've experienced this issue in Solace Bridge Outskirts, Soltown, and Ardoris. Any idea how to clear this problem up?