[CWB] Translations and visualisations

[Graham Ranger -- UAPV]

Hello,
I'm trying to set up text and translation visualisations inside cqpweb, 
as suggested here: 
http://liste.sslmit.unibo.it/pipermail/cwb/2014-February/001563.html
I put up a very basic corpus, below, for test purposes.

<text id = "english_test">
<s trans = "This is the original text.">
Ceci
est
la
traduction.
</s>
<s trans = "This is another sentence.">
Ceci
est
une
autre
phrase.
</s>
</text>

The problem I have is that when I try and set the visualisations in 
"Manage visualisations" > "(2) Free translations", then I can choose 
s_trans in the dropdown menu, but, on clicking "update settings", it 
reverts to "No XML element-attribute selected" and "Don't show 
anywhere". There is no accompanying error message. Maybe I have 
misunderstood the format of the corpus.
Any help will be appreciated as always!
G. R.
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