Joomla 2.5.14
VM 2.0.22d
Enabled "Allows to Ask a question"
Disabled "Allow non logged to send questions"
The Ask Question button is enabled but points to a blank page.
Fix: The Ask Question button should be visible only for logged-in users.
Not a bug. Without template overrides a "please login" message appears in the popup window. That will be OK for some VM users. For others either set "Allow non logged to send questions" as enabled, or use a template override with check for user logged in to show the button.