Sorry, my fault. #-o
You must change in file iframe-inc.php
$wugraphdir = '../wxwugraphs/'
to
$wugraphdir = './wxwugraphs/'
Will be fixed in new version (probably tomorrow).
Edit: I stuffed this fix into the current version (0.7.6b) … 
Sorry, my fault. #-o
You must change in file iframe-inc.php
$wugraphdir = '../wxwugraphs/'
to
$wugraphdir = './wxwugraphs/'
Will be fixed in new version (probably tomorrow).
Edit: I stuffed this fix into the current version (0.7.6b) …