please have a look at the options - there is a drop-down box where you can choose the size of your calibration board.
when upgrading, it was probably changed to the default of 55cm, which is wrong for your system.
therefore, please change it back to 90cm, click apply and close the options window. close the ppt software. restart the ppt software. recalibrate. this should fix it.
have fun!
Matthias
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