This issue exists for users on Mac computers running OS X 10.11 (El Capitan) who are also running an obsolete version of Logger Pro. Old......
Some recent changes mean that the new version no longer works on some older operating systems. The last version of Logger Pro to support Windows......
It is possible that the software on the LabQuest that supports the LabQuest Viewer functionality can get into a bad state. To recover from this......