In Logger Pro versions 1.2, 2.0, or 2.1 there was a problem with the experiment files installed for the Rotary Motion sensor. This problem can be fixed one of two ways.
1) Download and install the latest version of Logger Pro from the Vernier website at: http://www.vernier.com/tech/lpupdates.html.
2) Within Logger Pro, open the rotary motion experiment file. Select Sensors from the Setup menu. Click on the Details tab. Click on the Unlock button to unlock the details. In the Counts field, enter 360. Click the Lock button and then click the OK button at the bottom of the window. Save the experiment file so that next time it will be set correctly when it is opened. Perform this procedure for each of the rotary motion experiment files you use.