[pmwiki-users] n00b unable to edit docs

[Rude Yak]

Hi.  I'm new to pmwiki and I'm encountering some very odd behavior.  I'm able
to bring pages up for editing but when I submit changes, they are always lost
and I'm brought back to the editor pane.  Another odd (and probably related)
behavior is that the 'cancel' button also brings me right back to the editor
pane (?action=edit) rather than back to the "view" page for the document in
question.  Nothing odd is being written to my Apache error log and everything
else with pmwiki seems to be behaving normally.  I can see, using
LiveHttpHeaders, that the correct data is being sent to pmwiki.php, e.g. 

action=edit&n=Main.HomePage&basetime=1172186250&text=blah...blah...blah...&csum=&author=&cancel=+Cancel+

but the Redirect() call that should handle 'cancel' never happens - I'm just
returned to the edit page.  I have tried both 2.1.27 and 2.2.0-beta31 and the
same issue occurs.  Does anyone have any suggestions on where to start looking
for the cause of this problem?  

Thanks,

Erick.