[Pan-users] Newbie question about unviewable posts

[Graham Lawrence]

I click the post header in the top right pane, and sometimes the 
associated text appears in the bottom right pane, and sometimes it 
doesn't.  When it doesn't, I notice that an aqua icon in its header line
 is absent, which icon's presence means the article has been cached.  So
 I cache the post with the right click menu, and nothing happens, no 
icon appears in its header line, and still no text.

How do I view such posts, and why don't they cache?  BTW they are 
not empty posts, their header line declares they contain so many lines 
of text.  Thank you in advance for your help.