Default Project: A user can choose the default project that is selected when the user first logs in. This can be a specific project or "All Projects". For users that only work on one project, it would make sense to set such project as the default project (rather than "All Projects"). The active project is part of the filter applied on the issues listed in the "View Issues" page. Also any newly reported issues will be associated with the active project.
Refresh Delay: The refresh delay is used to specify the number of seconds between auto-refreshes of the View Issues page.
Redirect Delay: The redirect delay is the number of seconds to wait after displaying flash messages like "Issue created successfully", and before the user gets redirected to the next page.
Notes Sort Order: The preference relating to how notes should be ordered when issue is viewed or in email notifications. Ascending order means that older notes are displayed first
Email on XXX: If unticked, then the notifications related to the corresponding event would be disabled. User can also specify the minimum issue severity of for the email to be sent.
Note that the preference is only used to disable notifications that as per the administrator's configuration, this user would have qualified to receive.
Email Notes Limit: This preference can be used to limit the number of issue notes to be included in a email notifications. Specifying N here will cause only the latest N to be included. The value 0 means that all notes will be included.
Language: The preferred language of the user. This language is used by the GUI and in email notifications. Note that MantisBT uses UTF-8 for encoding the data, hence the user could for example use MantisBT with a Chinese interface, while logging issue data in German.