- When I set debugging to DEVELOPER I get the same error message as you do. That message is about strict compliance to XML standards, but it should not prevent the Questionnaire Module from executing.
- When I set debugging to ALL (Show all reasonable PHP debug messages) I see a number of PHP notices, e.g. "Notice: Trying to get property of non-object in C:\moodle\www\moodle18dev\moodle\mod\questionnaire\locallib.php on line 536". Again, those are just "notices" saying that something is not quite right in the PHP programming, but should not prevent the program from executing.
- Finally, with debugging set to NONE, the Questionnaire module executes fine on my Moodle 1.8 installation.
You do not say on which of your Moodle installations you are getting the blank page (1.7 or 1.8). You might try to re-install the actual version of Questionnaire (from the plugins section or from CVS is you are using CVS) and see what happens. I am still working on the patch re your message here Error with View by Response latest version. and hoping to incorporate a few more minor patches before committing to CVS (in the coming weeks).
Please keep me informed,
ATB
Joseph