Reading a cell value in CSV File

Is supposed that the Backpack will be emptied when I exit App Inventor.  When I restart AppInventor, my Backpack should be empty. But, It´s not. What can I do?

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In the latest AI2 update, the backpack is persistent. Which means that it will always have your blocks in it until you manually empty it.

Changes between nb154 and nb154a (February 15, 2017)
⦁ Make the Backpack persistent – If you leave MIT App Inventor with blocks left in your backpack, they will be there the next time you login.

http://appinventor.mit.edu/ai2/ReleaseNotes.html 

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We changed this behavior a few weeks ago. Before, the backpack was per session and so when you refreshed it was initialized empty. Now, we store the contents of the backpack in your user account so you can use them longer term. If you would like to clear your backpack, you can do so by right-clicking (ctrl+click on Mac) on the blocks workspace and select the "Empty the backpack" menu option.

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