This information pertains to the original LabQuest.

If you have LabQuest 2, see this article.

Repeatedly pressing the collect button after each collection can cause a crash or bad data to appear in the 1.0 version of the LabQuest software.

This problem has been fixed in the new release of the LabQuest App, which is available as a free download at:
http://www.vernier.com/labquest/updates/