Had a look, and the /webassist/ , /webassist/email/ and /webassist/progress_bar/ folders are all set to 755.
There was a file, waue_emailCandidates_1_Progress_xml.php file in there, which looked right in that the last time it was used it was for 6 emails.
I've attached it now to check that's what you'd expect ie a php file rather than an xml file.