Hmm, I did not test a quest giver dialog. Sorry. Well I did some checking and it looks like this might be the offender. I cannot find any other difference that might contribute.
<Page AbsorbsInput="false" BackgroundColor="#FF0000" GetsInput="false" Name="ChatPage" ScrollExtent="222,78" Size="222,78"
Visible="false">
Not sure why it got set to false, but removing that command should get it going.
Just search for the first occurrance of
ChatPage in the file and go to the end of the line and remove
Visible="false" from the text.