If two instances of Logger Pro are running at the same time with a LabQuest connected to a Windows computer and one attempts to exit the programs, both instances of Logger Pro will freeze and no longer respond to user inputs upon closing the second (last opened) instance.

Note that running multiple instances of Logger Pro with a connected interface can yield unexpected or erroneous results and in general is not supported. However, in this case, if one closes the initial instance of Logger Pro first, the program instances do not freeze and may be closed down cleanly.