When Mapit is opened in full-screen in a new tab, it is displayed outside the JIRA gadget context. This results in some limitations in terms of functionality. To make sure you have the full set of available Mapit functions, please navigate back to the regular dashboard view.
Note that the latitude and longitude fields need to be visible on the screen for the "See this issue in Mapit" feature to work. Please contact your JIRA administrator if this is not the case.