File Naming: %ct does not display anymore

Hi,

I had to reinstall SGP after my PC crashed.
I’m using version 2.6.0.17.
SGP no longer displays the temperature of the sensor of my canon1000D on the photos but indicates NA instead.
Here are 2 pictures one taken before my pc crashed and the other after.
M106__300sec_ISO800_28_03_2017_frame1_001158_13C.CR2
M106__300sec_ISO800_20_04_2017_frame9_000431_NA.CR2
I use the same profile. What i missed?
Best regards,
René