Battery Monitor: Cannnot enter values

I am using the APM1 built-in voltage sensors and try to calibrate it.

APM Planner 1.1.84 does not allow me to enter any value.

I set Monitor= 3: Battery Voltage, Capacity=3000

 

And then I try

1. APM Input Voltage =4.96 (thats what I measure)

2. Measured B

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RadioIn = 0 all channels

After a long winter break I wanted to make my first flight in 2012 with my easystar and APM (after having more than 50 flights with the same equipment in 2011)   During the initial ground testing I saw, that I could no change the APM modes any more.

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