[imp] Imp doesn't open some messages.

[Marco Maiani]

I have Horde 3.0.2 with Imp 4.0.1 . Since yesteday everything worked 
very well but now I have a problem with imp. When I open Imp I see the 
list of messages but when I click on them sometimes Imp doesn't open 
them. Weirdly, for the same user, some messages are opened and some 
other not but I don't find any difference among them: the links to the 
messages seems identical. When I click to the messages that doesn't open 
I see the progress bar opening for few seconds and then it disappear and 
the message window doesn't open.

Any idea?

Thanks

Marco