This is a 'possible' bug. It might not be.

On the page/tab: 'DELETE All Responses'

(Our URL is this)
mod/questionnaire/report.php?instance=1&sid=1&action=delallresp

We have found that the Lefthand menu does not appear in Base Theme, and in our own theme it causes the Lefthand menu to switch to the Righthand side

We dont think its a CSS problem with our theme, as our CSS works fine on the other pages that have an ID of #page-mod-questionnaire-report (which the 'Delete All Responses' page has too)

We had thought of simply setting a 'display:none' on our menu problem, using #page-mod-questionnaire-report as the identifier, but unfortunately this hides the menu on all the other pages that share the #page-mod-questionnaire-report ID

If the owner of the plug-in could take a quick look and see if there is an obvious problem as to why the Lefthand menu does not appear on this page, but does on all the others, that would be great. If there is no easy solution could you possibly make the identification of this page unique somehow. Adding an additional 'class' would probably be the best solution so that other people who are already untilising the #page-mod-questionnaire-report ID without difficulty, wouldnt need to make changes to their CSS.