>>I just added a new message (Update: the sent message to UT also diaappeared )
>>
>>and the tree disappeared
>>
>> All I see there is a nice globe on grey background
>
>As Naomi said, a right click refresh will force the browser to get the new version of the files directly from the server. Unless you have Chrome, I have discovered an issue with that and will be able to tell you what to do to workaround a bug in that browser.
>
>To which message did you attach a file?
the one which made the tree and itself disappear :-)